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15+10x=38+21x+9
We move all terms to the left:
15+10x-(38+21x+9)=0
We add all the numbers together, and all the variables
10x-(21x+47)+15=0
We get rid of parentheses
10x-21x-47+15=0
We add all the numbers together, and all the variables
-11x-32=0
We move all terms containing x to the left, all other terms to the right
-11x=32
x=32/-11
x=-2+10/11
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