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12(7-x)=36
We move all terms to the left:
12(7-x)-(36)=0
We add all the numbers together, and all the variables
12(-1x+7)-36=0
We multiply parentheses
-12x+84-36=0
We add all the numbers together, and all the variables
-12x+48=0
We move all terms containing x to the left, all other terms to the right
-12x=-48
x=-48/-12
x=+4
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