9=2r-3+6

Solution for 9=2r-3+6 equation:

Simplifying
9 = 2r + -3 + 6

Reorder the terms:
9 = -3 + 6 + 2r

Combine like terms: -3 + 6 = 3
9 = 3 + 2r

Solving
9 = 3 + 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 = 3 + 2r + -2r

Combine like terms: 2r + -2r = 0
9 + -2r = 3 + 0
9 + -2r = 3

Add '-9' to each side of the equation.
9 + -9 + -2r = 3 + -9

Combine like terms: 9 + -9 = 0
0 + -2r = 3 + -9
-2r = 3 + -9

Combine like terms: 3 + -9 = -6
-2r = -6

Divide each side by '-2'.
r = 3

Simplifying
r = 3