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21(x+3)=30x
We move all terms to the left:
21(x+3)-(30x)=0
We add all the numbers together, and all the variables
-30x+21(x+3)=0
We multiply parentheses
-30x+21x+63=0
We add all the numbers together, and all the variables
-9x+63=0
We move all terms containing x to the left, all other terms to the right
-9x=-63
x=-63/-9
x=+7
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