3x+20=4x+90

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Solution for 3x+20=4x+90 equation: 



3x+20=4x+90

We move all terms to the left:

3x+20-(4x+90)=0

We get rid of parentheses

3x-4x-90+20=0

We add all the numbers together, and all the variables

-1x-70=0

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

-x=70

x=70/-1

x=-70

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