(x*20)+(y*10)=300

Solution for (x*20)+(y*10)=300 equation:

Simplifying
(x * 20) + (y * 10) = 300

Reorder the terms for easier multiplication:
(20x) + (y * 10) = 300

Reorder the terms for easier multiplication:
(20x) + (10y) = 300

Solving
(20x) + (10y) = 300

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '(-10y)' to each side of the equation.
(20x) + (10y) + (-10y) = 300 + (-10y)

Combine like terms: (10y) + (-10y) = 0
(20x) + 0 = 300 + (-10y)
(20x) = 300 + (-10y)

Divide each side by '20'.
x = 15 + (-0.5y)

Simplifying
x = 15 + (-0.5y)