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3x-2x=-8-7=
We move all terms to the left:
3x-2x-(-8-7)=0
We add all the numbers together, and all the variables
3x-2x-(-15)=0
We add all the numbers together, and all the variables
x+15=0
We move all terms containing x to the left, all other terms to the right
x=-15
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