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3x+12=30-4x
We move all terms to the left:
3x+12-(30-4x)=0
We add all the numbers together, and all the variables
3x-(-4x+30)+12=0
We get rid of parentheses
3x+4x-30+12=0
We add all the numbers together, and all the variables
7x-18=0
We move all terms containing x to the left, all other terms to the right
7x=18
x=18/7
x=2+4/7
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