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(3x+12)=7x
We move all terms to the left:
(3x+12)-(7x)=0
We add all the numbers together, and all the variables
-7x+(3x+12)=0
We get rid of parentheses
-7x+3x+12=0
We add all the numbers together, and all the variables
-4x+12=0
We move all terms containing x to the left, all other terms to the right
-4x=-12
x=-12/-4
x=+3
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