4x+12+90=18

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Solution for 4x+12+90=18 equation: 



4x+12+90=18

We move all terms to the left:

4x+12+90-(18)=0

We add all the numbers together, and all the variables

4x+84=0

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

4x=-84

x=-84/4

x=-21

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