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-5x+3=-12-2x
We move all terms to the left:
-5x+3-(-12-2x)=0
We add all the numbers together, and all the variables
-5x-(-2x-12)+3=0
We get rid of parentheses
-5x+2x+12+3=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5
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