-5r-7(6+2r)=-99

Solution for -5r-7(6+2r)=-99 equation:

Simplifying
-5r + -7(6 + 2r) = -99
-5r + (6 * -7 + 2r * -7) = -99
-5r + (-42 + -14r) = -99

Reorder the terms:
-42 + -5r + -14r = -99

Combine like terms: -5r + -14r = -19r
-42 + -19r = -99

Solving
-42 + -19r = -99

Solving for variable 'r'.

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

Add '42' to each side of the equation.
-42 + 42 + -19r = -99 + 42

Combine like terms: -42 + 42 = 0
0 + -19r = -99 + 42
-19r = -99 + 42

Combine like terms: -99 + 42 = -57
-19r = -57

Divide each side by '-19'.
r = 3

Simplifying
r = 3