7r-9-2r=18

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


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

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

Combine like terms: 7r + -2r = 5r
-9 + 5r = 18

Solving
-9 + 5r = 18

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + 5r = 18 + 9

Combine like terms: -9 + 9 = 0
0 + 5r = 18 + 9
5r = 18 + 9

Combine like terms: 18 + 9 = 27
5r = 27

Divide each side by '5'.
r = 5.4

Simplifying
r = 5.4

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