9=r+(-8)

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Solution for 9=r+(-8) equation:


Simplifying
9 = r + (-8)
9 = r + -8

Reorder the terms:
9 = -8 + r

Solving
9 = -8 + 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.
9 + -1r = -8 + r + -1r

Combine like terms: r + -1r = 0
9 + -1r = -8 + 0
9 + -1r = -8

Add '-9' to each side of the equation.
9 + -9 + -1r = -8 + -9

Combine like terms: 9 + -9 = 0
0 + -1r = -8 + -9
-1r = -8 + -9

Combine like terms: -8 + -9 = -17
-1r = -17

Divide each side by '-1'.
r = 17

Simplifying
r = 17

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