9r-7r-2=18

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Solution for 9r-7r-2=18 equation: 


Simplifying
9r + -7r + -2 = 18

Reorder the terms:
-2 + 9r + -7r = 18

Combine like terms: 9r + -7r = 2r
-2 + 2r = 18

Solving
-2 + 2r = 18

Solving for variable 'r'.

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

Add '2' to each side of the equation.
-2 + 2 + 2r = 18 + 2

Combine like terms: -2 + 2 = 0
0 + 2r = 18 + 2
2r = 18 + 2

Combine like terms: 18 + 2 = 20
2r = 20

Divide each side by '2'.
r = 10

Simplifying
r = 10

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