87=3(r+8)

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Solution for 87=3(r+8) equation: 


Simplifying
87 = 3(r + 8)

Reorder the terms:
87 = 3(8 + r)
87 = (8 * 3 + r * 3)
87 = (24 + 3r)

Solving
87 = 24 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
87 + -3r = 24 + 3r + -3r

Combine like terms: 3r + -3r = 0
87 + -3r = 24 + 0
87 + -3r = 24

Add '-87' to each side of the equation.
87 + -87 + -3r = 24 + -87

Combine like terms: 87 + -87 = 0
0 + -3r = 24 + -87
-3r = 24 + -87

Combine like terms: 24 + -87 = -63
-3r = -63

Divide each side by '-3'.
r = 21

Simplifying
r = 21

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