-5x-8+12x+21=0

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Solution for -5x-8+12x+21=0 equation: 



-5x-8+12x+21=0

We add all the numbers together, and all the variables

7x+13=0

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

7x=-13

x=-13/7

x=-1+6/7

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