-3(r-3s-7)=

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Solution for -3(r-3s-7)= equation:


Simplifying
-3(r + -3s + -7) = 0

Reorder the terms:
-3(-7 + r + -3s) = 0
(-7 * -3 + r * -3 + -3s * -3) = 0
(21 + -3r + 9s) = 0

Solving
21 + -3r + 9s = 0

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 + -3r + -21 + 9s = 0 + -21

Reorder the terms:
21 + -21 + -3r + 9s = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3r + 9s = 0 + -21
-3r + 9s = 0 + -21

Combine like terms: 0 + -21 = -21
-3r + 9s = -21

Add '-9s' to each side of the equation.
-3r + 9s + -9s = -21 + -9s

Combine like terms: 9s + -9s = 0
-3r + 0 = -21 + -9s
-3r = -21 + -9s

Divide each side by '-3'.
r = 7 + 3s

Simplifying
r = 7 + 3s

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