I am attempting to write a trigger to add contacts that meet the qualifications, to a campaign as a campaign member.  I keep getting an error that I cannot seem to fix that says "AND operator can only be applied to Boolean expressions".  The line of code presenting the error is:

       if (account.RecordTypeId = '012800000007aDe' && contact.Email_Opt_In__c = 'true' && contact.CampaignMember.CampaignID != '70180000000jlhi' ) 

The rest of the code is posted below.  I appreciate any recommendations or explanations of this error.  Thanks!

trigger triggerContactCreateCampMember on Contact (after insert, after update) {

   List<CampaignMember> CampaignMember = new List<CampaignMember>();
   List<Contact> ContactsToAdd = new List<Contact>();
	
    Set<Id> conIds = new Set<Id>();
	 if(Trigger.isInsert || Trigger.isUpdate)
    //Store Contact ID
    for(Contact contact: Trigger.new)
    {
       if (account.RecordTypeId = '012800000007aDe' && contact.Email_Opt_In__c = 'true' && contact.CampaignMember.CampaignID != '70180000000jlhi' ) 
       conIds.add(contact.ID);
    }
		List<Contact> c = new List<Contact> ([SELECT c.Id,c.AccountId From Contact c
		WHERE Id IN :conIds]);

		for (Contact con : c) {

	if(conIds.size() > 0)
	
	{CampaignMember.add(new CampaignMember
		(      
                
                ContactId = c.Id,
                CampaignId = '70180000000jlhi'));

             
              insert CampaignMember;
        }
        }
}