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2(5x-10)=50
We move all terms to the left:
2(5x-10)-(50)=0
We multiply parentheses
10x-20-50=0
We add all the numbers together, and all the variables
10x-70=0
We move all terms containing x to the left, all other terms to the right
10x=70
x=70/10
x=7
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