4x+5x=3x+15

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Solution for 4x+5x=3x+15 equation: 



4x+5x=3x+15

We move all terms to the left:

4x+5x-(3x+15)=0

We add all the numbers together, and all the variables

9x-(3x+15)=0

We get rid of parentheses

9x-3x-15=0

We add all the numbers together, and all the variables

6x-15=0

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

6x=15

x=15/6

x=2+1/2

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