9=2r+1

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Solution for 9=2r+1 equation: 


Simplifying
9 = 2r + 1

Reorder the terms:
9 = 1 + 2r

Solving
9 = 1 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
9 + -2r = 1 + 2r + -2r

Combine like terms: 2r + -2r = 0
9 + -2r = 1 + 0
9 + -2r = 1

Add '-9' to each side of the equation.
9 + -9 + -2r = 1 + -9

Combine like terms: 9 + -9 = 0
0 + -2r = 1 + -9
-2r = 1 + -9

Combine like terms: 1 + -9 = -8
-2r = -8

Divide each side by '-2'.
r = 4

Simplifying
r = 4

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