12-5x,x=-18

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Solution for 12-5x,x=-18 equation: 



12-5x.x=-18

We move all terms to the left:

12-5x.x-(-18)=0

We add all the numbers together, and all the variables

-5x.x+30=0

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

-5x.x=-30

x=-30/1

x=-30

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