3x+21=5x+15

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



3x+21=5x+15

We move all terms to the left:

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

We get rid of parentheses

3x-5x-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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