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+25+(-2x)=(-12)
We move all terms to the left:
+25+(-2x)-((-12))=0
We add all the numbers together, and all the variables
(-2x)+37=0
We get rid of parentheses
-2x+37=0
We move all terms containing x to the left, all other terms to the right
-2x=-37
x=-37/-2
x=18+1/2
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