21=6r+5-7

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Solution for 21=6r+5-7 equation:


Simplifying
21 = 6r + 5 + -7

Reorder the terms:
21 = 5 + -7 + 6r

Combine like terms: 5 + -7 = -2
21 = -2 + 6r

Solving
21 = -2 + 6r

Solving for variable 'r'.

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

Add '-6r' to each side of the equation.
21 + -6r = -2 + 6r + -6r

Combine like terms: 6r + -6r = 0
21 + -6r = -2 + 0
21 + -6r = -2

Add '-21' to each side of the equation.
21 + -21 + -6r = -2 + -21

Combine like terms: 21 + -21 = 0
0 + -6r = -2 + -21
-6r = -2 + -21

Combine like terms: -2 + -21 = -23
-6r = -23

Divide each side by '-6'.
r = 3.833333333

Simplifying
r = 3.833333333

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