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5x+4+7x-2+3x=90
We move all terms to the left:
5x+4+7x-2+3x-(90)=0
We add all the numbers together, and all the variables
15x-88=0
We move all terms containing x to the left, all other terms to the right
15x=88
x=88/15
x=5+13/15
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