81=-9(r-4)

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Solution for 81=-9(r-4) equation:


Simplifying
81 = -9(r + -4)

Reorder the terms:
81 = -9(-4 + r)
81 = (-4 * -9 + r * -9)
81 = (36 + -9r)

Solving
81 = 36 + -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.
81 + 9r = 36 + -9r + 9r

Combine like terms: -9r + 9r = 0
81 + 9r = 36 + 0
81 + 9r = 36

Add '-81' to each side of the equation.
81 + -81 + 9r = 36 + -81

Combine like terms: 81 + -81 = 0
0 + 9r = 36 + -81
9r = 36 + -81

Combine like terms: 36 + -81 = -45
9r = -45

Divide each side by '9'.
r = -5

Simplifying
r = -5

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