20x+30=5x+90

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Solution for 20x+30=5x+90 equation: 



20x+30=5x+90

We move all terms to the left:

20x+30-(5x+90)=0

We get rid of parentheses

20x-5x-90+30=0

We add all the numbers together, and all the variables

15x-60=0

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

15x=60

x=60/15

x=4

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