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5x-1+5x+8+x+8=90
We move all terms to the left:
5x-1+5x+8+x+8-(90)=0
We add all the numbers together, and all the variables
11x-75=0
We move all terms containing x to the left, all other terms to the right
11x=75
x=75/11
x=6+9/11
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