21=7r-7

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Solution for 21=7r-7 equation: 


Simplifying
21 = 7r + -7

Reorder the terms:
21 = -7 + 7r

Solving
21 = -7 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
21 + -7r = -7 + 7r + -7r

Combine like terms: 7r + -7r = 0
21 + -7r = -7 + 0
21 + -7r = -7

Add '-21' to each side of the equation.
21 + -21 + -7r = -7 + -21

Combine like terms: 21 + -21 = 0
0 + -7r = -7 + -21
-7r = -7 + -21

Combine like terms: -7 + -21 = -28
-7r = -28

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

Simplifying
r = 4

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