7r-21=-13

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Solution for 7r-21=-13 equation: 


Simplifying
7r + -21 = -13

Reorder the terms:
-21 + 7r = -13

Solving
-21 + 7r = -13

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 + 7r = -13 + 21

Combine like terms: -21 + 21 = 0
0 + 7r = -13 + 21
7r = -13 + 21

Combine like terms: -13 + 21 = 8
7r = 8

Divide each side by '7'.
r = 1.142857143

Simplifying
r = 1.142857143

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