-12x+3x=-54

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Solution for -12x+3x=-54 equation: 



-12x+3x=-54

We move all terms to the left:

-12x+3x-(-54)=0

We add all the numbers together, and all the variables

-9x+54=0

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

-9x=-54

x=-54/-9

x=+6

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