7x+5x=-12

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Solution for 7x+5x=-12 equation: 



7x+5x=-12

We move all terms to the left:

7x+5x-(-12)=0

We add all the numbers together, and all the variables

12x+12=0

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

12x=-12

x=-12/12

x=-1

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