90=3x+9x+12

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Solution for 90=3x+9x+12 equation: 



90=3x+9x+12

We move all terms to the left:

90-(3x+9x+12)=0

We add all the numbers together, and all the variables

-(12x+12)+90=0

We get rid of parentheses

-12x-12+90=0

We add all the numbers together, and all the variables

-12x+78=0

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

-12x=-78

x=-78/-12

x=6+1/2

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