30+x+2x=90

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Solution for 30+x+2x=90 equation: 



30+x+2x=90

We move all terms to the left:

30+x+2x-(90)=0

We add all the numbers together, and all the variables

3x-60=0

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

3x=60

x=60/3

x=20

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