2(2.8-0.2y)-y=5

Solution for 2(2.8-0.2y)-y=5 equation:

Simplifying
2(2.8 + -0.2y) + -1y = 5
(2.8 * 2 + -0.2y * 2) + -1y = 5
(5.6 + -0.4y) + -1y = 5

Combine like terms: -0.4y + -1y = -1.4y
5.6 + -1.4y = 5

Solving
5.6 + -1.4y = 5

Solving for variable 'y'.

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

Add '-5.6' to each side of the equation.
5.6 + -5.6 + -1.4y = 5 + -5.6

Combine like terms: 5.6 + -5.6 = 0.0
0.0 + -1.4y = 5 + -5.6
-1.4y = 5 + -5.6

Combine like terms: 5 + -5.6 = -0.6
-1.4y = -0.6

Divide each side by '-1.4'.
y = 0.4285714286

Simplifying
y = 0.4285714286