5x+90=3x+120.

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Solution for 5x+90=3x+120. equation: 



5x+90=3x+120.

We move all terms to the left:

5x+90-(3x+120.)=0

We add all the numbers together, and all the variables

5x-(3x+120)+90=0

We get rid of parentheses

5x-3x-120+90=0

We add all the numbers together, and all the variables

2x-30=0

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

2x=30

x=30/2

x=15

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