-21+2x=4x+15

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Solution for -21+2x=4x+15 equation: 



-21+2x=4x+15

We move all terms to the left:

-21+2x-(4x+15)=0

We get rid of parentheses

2x-4x-15-21=0

We add all the numbers together, and all the variables

-2x-36=0

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

-2x=36

x=36/-2

x=-18

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