r+30=13

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Solution for r+30=13 equation: 


Simplifying
r + 30 = 13

Reorder the terms:
30 + r = 13

Solving
30 + r = 13

Solving for variable 'r'.

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

Add '-30' to each side of the equation.
30 + -30 + r = 13 + -30

Combine like terms: 30 + -30 = 0
0 + r = 13 + -30
r = 13 + -30

Combine like terms: 13 + -30 = -17
r = -17

Simplifying
r = -17

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