3x+5+4x=12-x

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



3x+5+4x=12-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x+4x-(-1x+12)+5=0

We add all the numbers together, and all the variables

7x-(-1x+12)+5=0

We get rid of parentheses

7x+1x-12+5=0

We add all the numbers together, and all the variables

8x-7=0

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

8x=7

x=7/8

x=7/8

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