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8x+21=2x+22+6x+6x
We move all terms to the left:
8x+21-(2x+22+6x+6x)=0
We add all the numbers together, and all the variables
8x-(14x+22)+21=0
We get rid of parentheses
8x-14x-22+21=0
We add all the numbers together, and all the variables
-6x-1=0
We move all terms containing x to the left, all other terms to the right
-6x=1
x=1/-6
x=-1/6
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