90=3x-15+2x

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Solution for 90=3x-15+2x equation: 



90=3x-15+2x

We move all terms to the left:

90-(3x-15+2x)=0

We add all the numbers together, and all the variables

-(5x-15)+90=0

We get rid of parentheses

-5x+15+90=0

We add all the numbers together, and all the variables

-5x+105=0

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

-5x=-105

x=-105/-5

x=+21

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