8=4(r+9)

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Solution for 8=4(r+9) equation:


Simplifying
8 = 4(r + 9)

Reorder the terms:
8 = 4(9 + r)
8 = (9 * 4 + r * 4)
8 = (36 + 4r)

Solving
8 = 36 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
8 + -4r = 36 + 4r + -4r

Combine like terms: 4r + -4r = 0
8 + -4r = 36 + 0
8 + -4r = 36

Add '-8' to each side of the equation.
8 + -8 + -4r = 36 + -8

Combine like terms: 8 + -8 = 0
0 + -4r = 36 + -8
-4r = 36 + -8

Combine like terms: 36 + -8 = 28
-4r = 28

Divide each side by '-4'.
r = -7

Simplifying
r = -7

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