4(3r-9)=12

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Solution for 4(3r-9)=12 equation:


Simplifying
4(3r + -9) = 12

Reorder the terms:
4(-9 + 3r) = 12
(-9 * 4 + 3r * 4) = 12
(-36 + 12r) = 12

Solving
-36 + 12r = 12

Solving for variable 'r'.

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

Add '36' to each side of the equation.
-36 + 36 + 12r = 12 + 36

Combine like terms: -36 + 36 = 0
0 + 12r = 12 + 36
12r = 12 + 36

Combine like terms: 12 + 36 = 48
12r = 48

Divide each side by '12'.
r = 4

Simplifying
r = 4

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