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120+10x=150-4x
We move all terms to the left:
120+10x-(150-4x)=0
We add all the numbers together, and all the variables
10x-(-4x+150)+120=0
We get rid of parentheses
10x+4x-150+120=0
We add all the numbers together, and all the variables
14x-30=0
We move all terms containing x to the left, all other terms to the right
14x=30
x=30/14
x=2+1/7
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