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(2x+3)+x=4x-12
We move all terms to the left:
(2x+3)+x-(4x-12)=0
We add all the numbers together, and all the variables
x+(2x+3)-(4x-12)=0
We get rid of parentheses
x+2x-4x+3+12=0
We add all the numbers together, and all the variables
-1x+15=0
We move all terms containing x to the left, all other terms to the right
-x=-15
x=-15/-1
x=+15
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