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21+15x=10x+50
We move all terms to the left:
21+15x-(10x+50)=0
We get rid of parentheses
15x-10x-50+21=0
We add all the numbers together, and all the variables
5x-29=0
We move all terms containing x to the left, all other terms to the right
5x=29
x=29/5
x=5+4/5
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