r-(18)=3

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Solution for r-(18)=3 equation: 


Simplifying
r + -1(18) = 3

Multiply -1 * 18
r + -18 = 3

Reorder the terms:
-18 + r = 3

Solving
-18 + r = 3

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 = 3 + 18

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

Combine like terms: 3 + 18 = 21
r = 21

Simplifying
r = 21

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