18x+21=15-2x

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Solution for 18x+21=15-2x equation: 



18x+21=15-2x

We move all terms to the left:

18x+21-(15-2x)=0

We add all the numbers together, and all the variables

18x-(-2x+15)+21=0

We get rid of parentheses

18x+2x-15+21=0

We add all the numbers together, and all the variables

20x+6=0

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

20x=-6

x=-6/20

x=-3/10

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