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90+82+81+2x/5=86
We move all terms to the left:
90+82+81+2x/5-(86)=0
We add all the numbers together, and all the variables
2x/5+167=0
We multiply all the terms by the denominator
2x+167*5=0
We add all the numbers together, and all the variables
2x+835=0
We move all terms containing x to the left, all other terms to the right
2x=-835
x=-835/2
x=-417+1/2
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