5x+15-8x=-21

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Solution for 5x+15-8x=-21 equation: 



5x+15-8x=-21

We move all terms to the left:

5x+15-8x-(-21)=0

We add all the numbers together, and all the variables

-3x+36=0

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

-3x=-36

x=-36/-3

x=+12

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