-5x+21=-3x+15

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Solution for -5x+21=-3x+15 equation: 



-5x+21=-3x+15

We move all terms to the left:

-5x+21-(-3x+15)=0

We get rid of parentheses

-5x+3x-15+21=0

We add all the numbers together, and all the variables

-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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