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x+12=7+2x=
We move all terms to the left:
x+12-(7+2x)=0
We add all the numbers together, and all the variables
x-(2x+7)+12=0
We get rid of parentheses
x-2x-7+12=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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