



 
Hi Laurie, The textbook or the student at this point will probably say to "collect like terms". By this they men to gather together the terms that have an x in them and the terms that are just numbers. Here are the terms with an x in them
so gathered together they become
Hence you have 2 + 1 + 4 = 7 x's and 1  4 + 1 =  2. Thus the expression simplifies to
I hope this helps,  


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