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5x+2(5x+5)+10=80
We move all terms to the left:
5x+2(5x+5)+10-(80)=0
We add all the numbers together, and all the variables
5x+2(5x+5)-70=0
We multiply parentheses
5x+10x+10-70=0
We add all the numbers together, and all the variables
15x-60=0
We move all terms containing x to the left, all other terms to the right
15x=60
x=60/15
x=4
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