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5(15+x)=100
We move all terms to the left:
5(15+x)-(100)=0
We add all the numbers together, and all the variables
5(x+15)-100=0
We multiply parentheses
5x+75-100=0
We add all the numbers together, and all the variables
5x-25=0
We move all terms containing x to the left, all other terms to the right
5x=25
x=25/5
x=5
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