12=1+8r+3r

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Solution for 12=1+8r+3r equation:


Simplifying
12 = 1 + 8r + 3r

Combine like terms: 8r + 3r = 11r
12 = 1 + 11r

Solving
12 = 1 + 11r

Solving for variable 'r'.

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

Add '-11r' to each side of the equation.
12 + -11r = 1 + 11r + -11r

Combine like terms: 11r + -11r = 0
12 + -11r = 1 + 0
12 + -11r = 1

Add '-12' to each side of the equation.
12 + -12 + -11r = 1 + -12

Combine like terms: 12 + -12 = 0
0 + -11r = 1 + -12
-11r = 1 + -12

Combine like terms: 1 + -12 = -11
-11r = -11

Divide each side by '-11'.
r = 1

Simplifying
r = 1

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