18+3x=-12

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Solution for 18+3x=-12 equation: 



18+3x=-12

We move all terms to the left:

18+3x-(-12)=0

We add all the numbers together, and all the variables

3x+30=0

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

3x=-30

x=-30/3

x=-10

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