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x=91-4x
We move all terms to the left:
x-(91-4x)=0
We add all the numbers together, and all the variables
x-(-4x+91)=0
We get rid of parentheses
x+4x-91=0
We add all the numbers together, and all the variables
5x-91=0
We move all terms containing x to the left, all other terms to the right
5x=91
x=91/5
x=18+1/5
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