13=18+r

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Solution for 13=18+r equation:


Simplifying
13 = 18 + r

Solving
13 = 18 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
13 + -1r = 18 + r + -1r

Combine like terms: r + -1r = 0
13 + -1r = 18 + 0
13 + -1r = 18

Add '-13' to each side of the equation.
13 + -13 + -1r = 18 + -13

Combine like terms: 13 + -13 = 0
0 + -1r = 18 + -13
-1r = 18 + -13

Combine like terms: 18 + -13 = 5
-1r = 5

Divide each side by '-1'.
r = -5

Simplifying
r = -5

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