x+10+3x+20=90

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Solution for x+10+3x+20=90 equation: 



x+10+3x+20=90

We move all terms to the left:

x+10+3x+20-(90)=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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