5x+4x=3x-12

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Solution for 5x+4x=3x-12 equation: 



5x+4x=3x-12

We move all terms to the left:

5x+4x-(3x-12)=0

We add all the numbers together, and all the variables

9x-(3x-12)=0

We get rid of parentheses

9x-3x+12=0

We add all the numbers together, and all the variables

6x+12=0

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

6x=-12

x=-12/6

x=-2

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