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10(2x-15)=21
We move all terms to the left:
10(2x-15)-(21)=0
We multiply parentheses
20x-150-21=0
We add all the numbers together, and all the variables
20x-171=0
We move all terms containing x to the left, all other terms to the right
20x=171
x=171/20
x=8+11/20
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