3(r-4)=a

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


Simplifying
3(r + -4) = a

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

Solving
-12 + 3r = a

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 = 12 + a

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

Divide each side by '3'.
r = 4 + 0.3333333333a

Simplifying
r = 4 + 0.3333333333a

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