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(7x+19)+(2x+12)=12
We move all terms to the left:
(7x+19)+(2x+12)-(12)=0
We get rid of parentheses
7x+2x+19+12-12=0
We add all the numbers together, and all the variables
9x+19=0
We move all terms containing x to the left, all other terms to the right
9x=-19
x=-19/9
x=-2+1/9
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