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X+9=4X+39
We move all terms to the left:
X+9-(4X+39)=0
We get rid of parentheses
X-4X-39+9=0
We add all the numbers together, and all the variables
-3X-30=0
We move all terms containing X to the left, all other terms to the right
-3X=30
X=30/-3
X=-10
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