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