12x+9=3x+90

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



12x+9=3x+90

We move all terms to the left:

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

We get rid of parentheses

12x-3x-90+9=0

We add all the numbers together, and all the variables

9x-81=0

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

9x=81

x=81/9

x=9

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