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5x+6=8x+21
We move all terms to the left:
5x+6-(8x+21)=0
We get rid of parentheses
5x-8x-21+6=0
We add all the numbers together, and all the variables
-3x-15=0
We move all terms containing x to the left, all other terms to the right
-3x=15
x=15/-3
x=-5
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