4r+2(3+5r)=-90

Solution for 4r+2(3+5r)=-90 equation:

Simplifying
4r + 2(3 + 5r) = -90
4r + (3 * 2 + 5r * 2) = -90
4r + (6 + 10r) = -90

Reorder the terms:
6 + 4r + 10r = -90

Combine like terms: 4r + 10r = 14r
6 + 14r = -90

Solving
6 + 14r = -90

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 + 14r = -90 + -6

Combine like terms: 6 + -6 = 0
0 + 14r = -90 + -6
14r = -90 + -6

Combine like terms: -90 + -6 = -96
14r = -96

Divide each side by '14'.
r = -6.857142857

Simplifying
r = -6.857142857