(3x-12)+(8x+3)=90

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Solution for (3x-12)+(8x+3)=90 equation: 



(3x-12)+(8x+3)=90

We move all terms to the left:

(3x-12)+(8x+3)-(90)=0

We get rid of parentheses

3x+8x-12+3-90=0

We add all the numbers together, and all the variables

11x-99=0

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

11x=99

x=99/11

x=9

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