3x-12x=90

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Solution for 3x-12x=90 equation: 



3x-12x=90

We move all terms to the left:

3x-12x-(90)=0

We add all the numbers together, and all the variables

-9x-90=0

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

-9x=90

x=90/-9

x=-10

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