(2-y)(-400)+(300)(y)=0

Solution for (2-y)(-400)+(300)(y)=0 equation:

Simplifying
(2 + -1y)(-400) + (300)(y) = 0

Reorder the terms for easier multiplication:
-400(2 + -1y) + (300)(y) = 0
(2 * -400 + -1y * -400) + (300)(y) = 0
(-800 + 400y) + (300)(y) = 0

Combine like terms: 400y + 300y = 700y
-800 + 700y = 0

Solving
-800 + 700y = 0

Solving for variable 'y'.

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

Add '800' to each side of the equation.
-800 + 800 + 700y = 0 + 800

Combine like terms: -800 + 800 = 0
0 + 700y = 0 + 800
700y = 0 + 800

Combine like terms: 0 + 800 = 800
700y = 800

Divide each side by '700'.
y = 1.142857143

Simplifying
y = 1.142857143