-5r-4(-5r-5)=-85

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Solution for -5r-4(-5r-5)=-85 equation:


Simplifying
-5r + -4(-5r + -5) = -85

Reorder the terms:
-5r + -4(-5 + -5r) = -85
-5r + (-5 * -4 + -5r * -4) = -85
-5r + (20 + 20r) = -85

Reorder the terms:
20 + -5r + 20r = -85

Combine like terms: -5r + 20r = 15r
20 + 15r = -85

Solving
20 + 15r = -85

Solving for variable 'r'.

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

Add '-20' to each side of the equation.
20 + -20 + 15r = -85 + -20

Combine like terms: 20 + -20 = 0
0 + 15r = -85 + -20
15r = -85 + -20

Combine like terms: -85 + -20 = -105
15r = -105

Divide each side by '15'.
r = -7

Simplifying
r = -7

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