4+2(1-5.5r)=-25.5

Solution for 4+2(1-5.5r)=-25.5 equation:

Simplifying
4 + 2(1 + -5.5r) = -25.5
4 + (1 * 2 + -5.5r * 2) = -25.5
4 + (2 + -11r) = -25.5

Combine like terms: 4 + 2 = 6
6 + -11r = -25.5

Solving
6 + -11r = -25.5

Solving for variable 'r'.

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

Add '-6' to each side of the equation.
6 + -6 + -11r = -25.5 + -6

Combine like terms: 6 + -6 = 0
0 + -11r = -25.5 + -6
-11r = -25.5 + -6

Combine like terms: -25.5 + -6 = -31.5
-11r = -31.5

Divide each side by '-11'.
r = 2.863636364

Simplifying
r = 2.863636364