8x+21=-10x-15

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Solution for 8x+21=-10x-15 equation: 



8x+21=-10x-15

We move all terms to the left:

8x+21-(-10x-15)=0

We get rid of parentheses

8x+10x+15+21=0

We add all the numbers together, and all the variables

18x+36=0

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

18x=-36

x=-36/18

x=-2

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