21+(-2x)=15

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Solution for 21+(-2x)=15 equation: 



21+(-2x)=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

(-2x)+6=0

We get rid of parentheses

-2x+6=0

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

-2x=-6

x=-6/-2

x=+3

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