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5(2+x)-4=81
We move all terms to the left:
5(2+x)-4-(81)=0
We add all the numbers together, and all the variables
5(x+2)-4-81=0
We add all the numbers together, and all the variables
5(x+2)-85=0
We multiply parentheses
5x+10-85=0
We add all the numbers together, and all the variables
5x-75=0
We move all terms containing x to the left, all other terms to the right
5x=75
x=75/5
x=15
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