r-18=13+18

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Solution for r-18=13+18 equation: 


Simplifying
r + -18 = 13 + 18

Reorder the terms:
-18 + r = 13 + 18

Combine like terms: 13 + 18 = 31
-18 + r = 31

Solving
-18 + r = 31

Solving for variable 'r'.

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

Add '18' to each side of the equation.
-18 + 18 + r = 31 + 18

Combine like terms: -18 + 18 = 0
0 + r = 31 + 18
r = 31 + 18

Combine like terms: 31 + 18 = 49
r = 49

Simplifying
r = 49

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