-30+3x+x=30

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Solution for -30+3x+x=30 equation: 



-30+3x+x=30

We move all terms to the left:

-30+3x+x-(30)=0

We add all the numbers together, and all the variables

4x-60=0

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

4x=60

x=60/4

x=15

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