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6x+7x-21=84-8x
We move all terms to the left:
6x+7x-21-(84-8x)=0
We add all the numbers together, and all the variables
6x+7x-(-8x+84)-21=0
We add all the numbers together, and all the variables
13x-(-8x+84)-21=0
We get rid of parentheses
13x+8x-84-21=0
We add all the numbers together, and all the variables
21x-105=0
We move all terms containing x to the left, all other terms to the right
21x=105
x=105/21
x=5
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