Simplifying x+7−8x3=176−5x2.
3x+21−8x3=17−15x6
6(3x+21−8x)=3(17−15x)
18x+126−48x=51−45x
−30x+126−51+45x=0
15x+75=0
15x=−75
x=−5
x+7-8x/3=17/6_5x/2