3+r=18

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Solution for 3+r=18 equation: 


Simplifying
3 + r = 18

Solving
3 + r = 18

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + r = 18 + -3

Combine like terms: 3 + -3 = 0
0 + r = 18 + -3
r = 18 + -3

Combine like terms: 18 + -3 = 15
r = 15

Simplifying
r = 15

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