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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