4r-9-2r=18

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Solution for 4r-9-2r=18 equation: 


Simplifying
4r + -9 + -2r = 18

Reorder the terms:
-9 + 4r + -2r = 18

Combine like terms: 4r + -2r = 2r
-9 + 2r = 18

Solving
-9 + 2r = 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 + 2r = 18 + 9

Combine like terms: -9 + 9 = 0
0 + 2r = 18 + 9
2r = 18 + 9

Combine like terms: 18 + 9 = 27
2r = 27

Divide each side by '2'.
r = 13.5

Simplifying
r = 13.5

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