$$\sum_{n=1}^{ $\infty$}{x/(1-x)}$$
(5x+6)(8x-4)
x^3=3x
solve for x, (-400+x^2) - 0.1475x - 2621.44=0
3x(x-7)
metod de sustitución
If x = 12.5 cm, what is the area of the rectangle?
(1+7)+2= +2
5=7*10^(-3x)
