3(r-1)=-9

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Solution for 3(r-1)=-9 equation: 


Simplifying
3(r + -1) = -9

Reorder the terms:
3(-1 + r) = -9
(-1 * 3 + r * 3) = -9
(-3 + 3r) = -9

Solving
-3 + 3r = -9

Solving for variable 'r'.

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

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

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

Combine like terms: -9 + 3 = -6
3r = -6

Divide each side by '3'.
r = -2

Simplifying
r = -2

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