12x+42=-8.5x-40

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Solution for 12x+42=-8.5x-40 equation: 



12x+42=-8.5x-40

We move all terms to the left:

12x+42-(-8.5x-40)=0

We get rid of parentheses

12x+8.5x+40+42=0

We add all the numbers together, and all the variables

20.5x+82=0

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

20.5x=-82

x=-82/20.5

x=-4

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