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6x+8=3x+7+2x+21
We move all terms to the left:
6x+8-(3x+7+2x+21)=0
We add all the numbers together, and all the variables
6x-(5x+28)+8=0
We get rid of parentheses
6x-5x-28+8=0
We add all the numbers together, and all the variables
x-20=0
We move all terms containing x to the left, all other terms to the right
x=20
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