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2x+5+7=-10x
We move all terms to the left:
2x+5+7-(-10x)=0
We add all the numbers together, and all the variables
2x-(-10x)+12=0
We get rid of parentheses
2x+10x+12=0
We add all the numbers together, and all the variables
12x+12=0
We move all terms containing x to the left, all other terms to the right
12x=-12
x=-12/12
x=-1
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