One subtracted from four times a number - E. 4x - 1
x^2 - 53x + 1 = 0
y'''' - 5y''+4y=0
(x+2)(x-5)
differentiate y=-2/3x^6
6^2+4/(3*8)-8
5y-7=185y-7=18
a+b=10
x+a=20
x+b=24
a.b'+c=1
a+c=1
x+y=20
x+z=24
