3(r-4)=18

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Solution for 3(r-4)=18 equation: 


Simplifying
3(r + -4) = 18

Reorder the terms:
3(-4 + r) = 18
(-4 * 3 + r * 3) = 18
(-12 + 3r) = 18

Solving
-12 + 3r = 18

Solving for variable 'r'.

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

Add '12' to each side of the equation.
-12 + 12 + 3r = 18 + 12

Combine like terms: -12 + 12 = 0
0 + 3r = 18 + 12
3r = 18 + 12

Combine like terms: 18 + 12 = 30
3r = 30

Divide each side by '3'.
r = 10

Simplifying
r = 10

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