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7+9x=-12+x
We move all terms to the left:
7+9x-(-12+x)=0
We add all the numbers together, and all the variables
9x-(x-12)+7=0
We get rid of parentheses
9x-x+12+7=0
We add all the numbers together, and all the variables
8x+19=0
We move all terms containing x to the left, all other terms to the right
8x=-19
x=-19/8
x=-2+3/8
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