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6x+3x-2x+5x+7x=57
We move all terms to the left:
6x+3x-2x+5x+7x-(57)=0
We add all the numbers together, and all the variables
19x-57=0
We move all terms containing x to the left, all other terms to the right
19x=57
x=57/19
x=3
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