3x+8x=-12

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Solution for 3x+8x=-12 equation: 



3x+8x=-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

11x+12=0

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

11x=-12

x=-12/11

x=-1+1/11

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