21-r=7

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Solution for 21-r=7 equation: 


Simplifying
21 + -1r = 7

Solving
21 + -1r = 7

Solving for variable 'r'.

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

Add '-21' to each side of the equation.
21 + -21 + -1r = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -1r = 7 + -21
-1r = 7 + -21

Combine like terms: 7 + -21 = -14
-1r = -14

Divide each side by '-1'.
r = 14

Simplifying
r = 14

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