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4(x-5)=81
We move all terms to the left:
4(x-5)-(81)=0
We multiply parentheses
4x-20-81=0
We add all the numbers together, and all the variables
4x-101=0
We move all terms containing x to the left, all other terms to the right
4x=101
x=101/4
x=25+1/4
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