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6x-42=-39-3x
We move all terms to the left:
6x-42-(-39-3x)=0
We add all the numbers together, and all the variables
6x-(-3x-39)-42=0
We get rid of parentheses
6x+3x+39-42=0
We add all the numbers together, and all the variables
9x-3=0
We move all terms containing x to the left, all other terms to the right
9x=3
x=3/9
x=1/3
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