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48+9x=120+3x
We move all terms to the left:
48+9x-(120+3x)=0
We add all the numbers together, and all the variables
9x-(3x+120)+48=0
We get rid of parentheses
9x-3x-120+48=0
We add all the numbers together, and all the variables
6x-72=0
We move all terms containing x to the left, all other terms to the right
6x=72
x=72/6
x=12
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