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-3x-5x+4-x+7=88
We move all terms to the left:
-3x-5x+4-x+7-(88)=0
We add all the numbers together, and all the variables
-9x-77=0
We move all terms containing x to the left, all other terms to the right
-9x=77
x=77/-9
x=-8+5/9
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