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135+5x-4+7x-64+120+6x-8+4x+15+3x+31=700
We move all terms to the left:
135+5x-4+7x-64+120+6x-8+4x+15+3x+31-(700)=0
We add all the numbers together, and all the variables
25x-475=0
We move all terms containing x to the left, all other terms to the right
25x=475
x=475/25
x=19
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