20=7+3(r+6)

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Solution for 20=7+3(r+6) equation:


Simplifying
20 = 7 + 3(r + 6)

Reorder the terms:
20 = 7 + 3(6 + r)
20 = 7 + (6 * 3 + r * 3)
20 = 7 + (18 + 3r)

Combine like terms: 7 + 18 = 25
20 = 25 + 3r

Solving
20 = 25 + 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.
20 + -3r = 25 + 3r + -3r

Combine like terms: 3r + -3r = 0
20 + -3r = 25 + 0
20 + -3r = 25

Add '-20' to each side of the equation.
20 + -20 + -3r = 25 + -20

Combine like terms: 20 + -20 = 0
0 + -3r = 25 + -20
-3r = 25 + -20

Combine like terms: 25 + -20 = 5
-3r = 5

Divide each side by '-3'.
r = -1.666666667

Simplifying
r = -1.666666667

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