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-3x+39=-9x+51
We move all terms to the left:
-3x+39-(-9x+51)=0
We get rid of parentheses
-3x+9x-51+39=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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