-21r-47=100

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Solution for -21r-47=100 equation: 


Simplifying
-21r + -47 = 100

Reorder the terms:
-47 + -21r = 100

Solving
-47 + -21r = 100

Solving for variable 'r'.

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

Add '47' to each side of the equation.
-47 + 47 + -21r = 100 + 47

Combine like terms: -47 + 47 = 0
0 + -21r = 100 + 47
-21r = 100 + 47

Combine like terms: 100 + 47 = 147
-21r = 147

Divide each side by '-21'.
r = -7

Simplifying
r = -7

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