84=3(4+3r)

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Solution for 84=3(4+3r) equation:


Simplifying
84 = 3(4 + 3r)
84 = (4 * 3 + 3r * 3)
84 = (12 + 9r)

Solving
84 = 12 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
84 + -9r = 12 + 9r + -9r

Combine like terms: 9r + -9r = 0
84 + -9r = 12 + 0
84 + -9r = 12

Add '-84' to each side of the equation.
84 + -84 + -9r = 12 + -84

Combine like terms: 84 + -84 = 0
0 + -9r = 12 + -84
-9r = 12 + -84

Combine like terms: 12 + -84 = -72
-9r = -72

Divide each side by '-9'.
r = 8

Simplifying
r = 8

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