8r-9=2r+12

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Solution for 8r-9=2r+12 equation:


Simplifying
8r + -9 = 2r + 12

Reorder the terms:
-9 + 8r = 2r + 12

Reorder the terms:
-9 + 8r = 12 + 2r

Solving
-9 + 8r = 12 + 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 + 8r + -2r = 12 + 2r + -2r

Combine like terms: 8r + -2r = 6r
-9 + 6r = 12 + 2r + -2r

Combine like terms: 2r + -2r = 0
-9 + 6r = 12 + 0
-9 + 6r = 12

Add '9' to each side of the equation.
-9 + 9 + 6r = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 6r = 12 + 9
6r = 12 + 9

Combine like terms: 12 + 9 = 21
6r = 21

Divide each side by '6'.
r = 3.5

Simplifying
r = 3.5

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