5x-15=3x+21

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



5x-15=3x+21

We move all terms to the left:

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

We get rid of parentheses

5x-3x-21-15=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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