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-12x+12x-5x=-19-31
We move all terms to the left:
-12x+12x-5x-(-19-31)=0
We add all the numbers together, and all the variables
-12x+12x-5x-(-50)=0
We add all the numbers together, and all the variables
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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