x-30+x+12=120

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Solution for x-30+x+12=120 equation: 



x-30+x+12=120

We move all terms to the left:

x-30+x+12-(120)=0

We add all the numbers together, and all the variables

2x-138=0

We move all terms containing x to the left, all other terms to the right

2x=138

x=138/2

x=69

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