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6x-78=30-3x
We move all terms to the left:
6x-78-(30-3x)=0
We add all the numbers together, and all the variables
6x-(-3x+30)-78=0
We get rid of parentheses
6x+3x-30-78=0
We add all the numbers together, and all the variables
9x-108=0
We move all terms containing x to the left, all other terms to the right
9x=108
x=108/9
x=12
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