-1.8=-3.6+2.1y-0.3y

Solution for -1.8=-3.6+2.1y-0.3y equation:

Simplifying
-1.8 = -3.6 + 2.1y + -0.3y

Combine like terms: 2.1y + -0.3y = 1.8y
-1.8 = -3.6 + 1.8y

Solving
-1.8 = -3.6 + 1.8y

Solving for variable 'y'.

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

Add '-1.8y' to each side of the equation.
-1.8 + -1.8y = -3.6 + 1.8y + -1.8y

Combine like terms: 1.8y + -1.8y = 0.0
-1.8 + -1.8y = -3.6 + 0.0
-1.8 + -1.8y = -3.6

Add '1.8' to each side of the equation.
-1.8 + 1.8 + -1.8y = -3.6 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -1.8y = -3.6 + 1.8
-1.8y = -3.6 + 1.8

Combine like terms: -3.6 + 1.8 = -1.8
-1.8y = -1.8

Divide each side by '-1.8'.
y = 1

Simplifying
y = 1