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5x=90+x
We move all terms to the left:
5x-(90+x)=0
We add all the numbers together, and all the variables
5x-(x+90)=0
We get rid of parentheses
5x-x-90=0
We add all the numbers together, and all the variables
4x-90=0
We move all terms containing x to the left, all other terms to the right
4x=90
x=90/4
x=22+1/2
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