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-9(1-x)+15-28=35(1-x-7
We move all terms to the left:
-9(1-x)+15-28-(35(1-x-7)=0
We add all the numbers together, and all the variables
-9(-1x+1)-(35(-1x-6)+15-28=0
We multiply parentheses
9x-(35(-1x-6)+15-28-9=0
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