r+7=28

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Solution for r+7=28 equation: 


Simplifying
r + 7 = 28

Reorder the terms:
7 + r = 28

Solving
7 + r = 28

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 + r = 28 + -7

Combine like terms: 7 + -7 = 0
0 + r = 28 + -7
r = 28 + -7

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

Simplifying
r = 21

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