3(r-7)=9

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Solution for 3(r-7)=9 equation: 


Simplifying
3(r + -7) = 9

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

Solving
-21 + 3r = 9

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 + 3r = 9 + 21

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

Combine like terms: 9 + 21 = 30
3r = 30

Divide each side by '3'.
r = 10

Simplifying
r = 10

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