2(.8-1.8y)-y=7

Solution for 2(.8-1.8y)-y=7 equation:

Simplifying
2(0.8 + -1.8y) + -1y = 7
(0.8 * 2 + -1.8y * 2) + -1y = 7
(1.6 + -3.6y) + -1y = 7

Combine like terms: -3.6y + -1y = -4.6y
1.6 + -4.6y = 7

Solving
1.6 + -4.6y = 7

Solving for variable 'y'.

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

Add '-1.6' to each side of the equation.
1.6 + -1.6 + -4.6y = 7 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -4.6y = 7 + -1.6
-4.6y = 7 + -1.6

Combine like terms: 7 + -1.6 = 5.4
-4.6y = 5.4

Divide each side by '-4.6'.
y = -1.173913043

Simplifying
y = -1.173913043