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2(5x-15)=55
We move all terms to the left:
2(5x-15)-(55)=0
We multiply parentheses
10x-30-55=0
We add all the numbers together, and all the variables
10x-85=0
We move all terms containing x to the left, all other terms to the right
10x=85
x=85/10
x=8+1/2
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