9x+3=5x+15.

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Solution for 9x+3=5x+15. equation: 



9x+3=5x+15.

We move all terms to the left:

9x+3-(5x+15.)=0

We add all the numbers together, and all the variables

9x-(5x+15)+3=0

We get rid of parentheses

9x-5x-15+3=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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