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15+6=10x+21
We move all terms to the left:
15+6-(10x+21)=0
We add all the numbers together, and all the variables
-(10x+21)+21=0
We get rid of parentheses
-10x-21+21=0
We add all the numbers together, and all the variables
-10x=0
x=0/-10
x=0
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