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10x+(3x-5)=21
We move all terms to the left:
10x+(3x-5)-(21)=0
We get rid of parentheses
10x+3x-5-21=0
We add all the numbers together, and all the variables
13x-26=0
We move all terms containing x to the left, all other terms to the right
13x=26
x=26/13
x=2
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