4r-7=21

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Solution for 4r-7=21 equation: 


Simplifying
4r + -7 = 21

Reorder the terms:
-7 + 4r = 21

Solving
-7 + 4r = 21

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + 4r = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 4r = 21 + 7
4r = 21 + 7

Combine like terms: 21 + 7 = 28
4r = 28

Divide each side by '4'.
r = 7

Simplifying
r = 7

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