5x+4x=12-x

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



5x+4x=12-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

5x+4x-(-1x+12)=0

We add all the numbers together, and all the variables

9x-(-1x+12)=0

We get rid of parentheses

9x+1x-12=0

We add all the numbers together, and all the variables

10x-12=0

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

10x=12

x=12/10

x=1+1/5

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