5r+3(1r-7)=-85

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Solution for 5r+3(1r-7)=-85 equation:


Simplifying
5r + 3(1r + -7) = -85

Reorder the terms:
5r + 3(-7 + 1r) = -85
5r + (-7 * 3 + 1r * 3) = -85
5r + (-21 + 3r) = -85

Reorder the terms:
-21 + 5r + 3r = -85

Combine like terms: 5r + 3r = 8r
-21 + 8r = -85

Solving
-21 + 8r = -85

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 8r = -85 + 21

Combine like terms: -21 + 21 = 0
0 + 8r = -85 + 21
8r = -85 + 21

Combine like terms: -85 + 21 = -64
8r = -64

Divide each side by '8'.
r = -8

Simplifying
r = -8

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