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21x+9=15x+6
We move all terms to the left:
21x+9-(15x+6)=0
We get rid of parentheses
21x-15x-6+9=0
We add all the numbers together, and all the variables
6x+3=0
We move all terms containing x to the left, all other terms to the right
6x=-3
x=-3/6
x=-1/2
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