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92+87+88+x/4=90
We move all terms to the left:
92+87+88+x/4-(90)=0
We add all the numbers together, and all the variables
x/4+177=0
We multiply all the terms by the denominator
x+177*4=0
We add all the numbers together, and all the variables
x+708=0
We move all terms containing x to the left, all other terms to the right
x=-708
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