90=45+3x-12

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Solution for 90=45+3x-12 equation: 



90=45+3x-12

We move all terms to the left:

90-(45+3x-12)=0

We add all the numbers together, and all the variables

-(3x+33)+90=0

We get rid of parentheses

-3x-33+90=0

We add all the numbers together, and all the variables

-3x+57=0

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

-3x=-57

x=-57/-3

x=+19

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