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3(-25-X)=21-9X
We move all terms to the left:
3(-25-X)-(21-9X)=0
We add all the numbers together, and all the variables
3(-1X-25)-(-9X+21)=0
We multiply parentheses
-3X-(-9X+21)-75=0
We get rid of parentheses
-3X+9X-21-75=0
We add all the numbers together, and all the variables
6X-96=0
We move all terms containing X to the left, all other terms to the right
6X=96
X=96/6
X=16
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