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(12x+5)+(7-3x)=3
We move all terms to the left:
(12x+5)+(7-3x)-(3)=0
We add all the numbers together, and all the variables
(12x+5)+(-3x+7)-3=0
We get rid of parentheses
12x-3x+5+7-3=0
We add all the numbers together, and all the variables
9x+9=0
We move all terms containing x to the left, all other terms to the right
9x=-9
x=-9/9
x=-1
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