x-15=x*(80/100)

Solution for x-15=x*(80/100) equation:

x-15=x(80/100)

We move all terms to the left:

x-15-(x(80/100))=0

We add all the numbers together, and all the variables

x-(x(+80/100))-15=0

We multiply all the terms by the denominator


x*100))-(x(+80-15*100))=0

We add all the numbers together, and all the variables

x*100))-(x(-1420))=0

We add all the numbers together, and all the variables

x*100))-(x(=0

Wy multiply elements

100x^2=0

a = 100; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·100·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{0}{200}=0$