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7x-3-4x=-13-2
We move all terms to the left:
7x-3-4x-(-13-2)=0
We add all the numbers together, and all the variables
7x-4x-3-(-15)=0
We add all the numbers together, and all the variables
3x+12=0
We move all terms containing x to the left, all other terms to the right
3x=-12
x=-12/3
x=-4
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