90=3x+42

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Solution for 90=3x+42 equation: 



90=3x+42

We move all terms to the left:

90-(3x+42)=0

We get rid of parentheses

-3x-42+90=0

We add all the numbers together, and all the variables

-3x+48=0

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

-3x=-48

x=-48/-3

x=+16

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