90=45+15+4x

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Solution for 90=45+15+4x equation: 



90=45+15+4x

We move all terms to the left:

90-(45+15+4x)=0

We add all the numbers together, and all the variables

-(4x+60)+90=0

We get rid of parentheses

-4x-60+90=0

We add all the numbers together, and all the variables

-4x+30=0

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

-4x=-30

x=-30/-4

x=7+1/2

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