30x+120=42x

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Solution for 30x+120=42x equation: 



30x+120=42x

We move all terms to the left:

30x+120-(42x)=0

We add all the numbers together, and all the variables

-12x+120=0

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

-12x=-120

x=-120/-12

x=+10

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