21+7x=-15-2x

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Solution for 21+7x=-15-2x equation: 



21+7x=-15-2x

We move all terms to the left:

21+7x-(-15-2x)=0

We add all the numbers together, and all the variables

7x-(-2x-15)+21=0

We get rid of parentheses

7x+2x+15+21=0

We add all the numbers together, and all the variables

9x+36=0

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

9x=-36

x=-36/9

x=-4

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