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9+4x=39+2x
We move all terms to the left:
9+4x-(39+2x)=0
We add all the numbers together, and all the variables
4x-(2x+39)+9=0
We get rid of parentheses
4x-2x-39+9=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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