3x+5x=72-x

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Solution for 3x+5x=72-x equation: 



3x+5x=72-x

We move all terms to the left:

3x+5x-(72-x)=0

We add all the numbers together, and all the variables

3x+5x-(-1x+72)=0

We add all the numbers together, and all the variables

8x-(-1x+72)=0

We get rid of parentheses

8x+1x-72=0

We add all the numbers together, and all the variables

9x-72=0

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

9x=72

x=72/9

x=8

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