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9x+15-8x=-3-12
We move all terms to the left:
9x+15-8x-(-3-12)=0
We add all the numbers together, and all the variables
9x-8x+15-(-15)=0
We add all the numbers together, and all the variables
x+30=0
We move all terms containing x to the left, all other terms to the right
x=-30
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