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15x=21+8x
We move all terms to the left:
15x-(21+8x)=0
We add all the numbers together, and all the variables
15x-(8x+21)=0
We get rid of parentheses
15x-8x-21=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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