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-4x-6=21+5x
We move all terms to the left:
-4x-6-(21+5x)=0
We add all the numbers together, and all the variables
-4x-(5x+21)-6=0
We get rid of parentheses
-4x-5x-21-6=0
We add all the numbers together, and all the variables
-9x-27=0
We move all terms containing x to the left, all other terms to the right
-9x=27
x=27/-9
x=-3
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