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7=12+x1
We move all terms to the left:
7-(12+x1)=0
We add all the numbers together, and all the variables
-(x+12)+7=0
We get rid of parentheses
-x-12+7=0
We add all the numbers together, and all the variables
-1x-5=0
We move all terms containing x to the left, all other terms to the right
-x=5
x=5/-1
x=-5
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