1-r-8=9

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Solution for 1-r-8=9 equation:


Simplifying
1 + -1r + -8 = 9

Reorder the terms:
1 + -8 + -1r = 9

Combine like terms: 1 + -8 = -7
-7 + -1r = 9

Solving
-7 + -1r = 9

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + -1r = 9 + 7

Combine like terms: -7 + 7 = 0
0 + -1r = 9 + 7
-1r = 9 + 7

Combine like terms: 9 + 7 = 16
-1r = 16

Divide each side by '-1'.
r = -16

Simplifying
r = -16

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