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8x+9x-21=63-4x
We move all terms to the left:
8x+9x-21-(63-4x)=0
We add all the numbers together, and all the variables
8x+9x-(-4x+63)-21=0
We add all the numbers together, and all the variables
17x-(-4x+63)-21=0
We get rid of parentheses
17x+4x-63-21=0
We add all the numbers together, and all the variables
21x-84=0
We move all terms containing x to the left, all other terms to the right
21x=84
x=84/21
x=4
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