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3x+7x-28+31-8x=2043
We move all terms to the left:
3x+7x-28+31-8x-(2043)=0
We add all the numbers together, and all the variables
2x-2040=0
We move all terms containing x to the left, all other terms to the right
2x=2040
x=2040/2
x=1020
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