#1**+10 **

$$\\-48+9(x^4-x)=6(12-x)+9x^4\\

-48+9x^4-9x=72-6x+9x^4\\

-48-9x=72-6x\\

$add 6x to both sides$\\

-48-3x=72\\

$add 48 to both sides$\\

-3x=120\\

x=-40$$

Melody Dec 23, 2014

#4**+5 **

**-48+9(x4−4x)=6(12−x)+9x4-48+9x4−36x=72−6x+9x4-48+9x4=72+30x+9x4-120+9x4=30x+9x4-120=30x-4=x**

shaniab29544 Dec 23, 2014

#5**+5 **

I cannot make sense of what you have done Shaniab.

Remember - one equal sign per line - NEVER MORE

Melody Dec 23, 2014