8=r-(-18)

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Solution for 8=r-(-18) equation:


Simplifying
8 = r + -1(-18)

Multiply -1 * -18
8 = r + 18

Reorder the terms:
8 = 18 + r

Solving
8 = 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.
8 + -1r = 18 + r + -1r

Combine like terms: r + -1r = 0
8 + -1r = 18 + 0
8 + -1r = 18

Add '-8' to each side of the equation.
8 + -8 + -1r = 18 + -8

Combine like terms: 8 + -8 = 0
0 + -1r = 18 + -8
-1r = 18 + -8

Combine like terms: 18 + -8 = 10
-1r = 10

Divide each side by '-1'.
r = -10

Simplifying
r = -10

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