R(r-1)-3r=4+8

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Solution for R(r-1)-3r=4+8 equation: 


Simplifying
R(r + -1) + -3r = 4 + 8

Reorder the terms:
R(-1 + r) + -3r = 4 + 8
(-1 * R + r * R) + -3r = 4 + 8
(-1R + rR) + -3r = 4 + 8

Reorder the terms:
-1R + -3r + rR = 4 + 8

Combine like terms: 4 + 8 = 12
-1R + -3r + rR = 12

Solving
-1R + -3r + rR = 12

Solving for variable 'R'.

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

Add '3r' to each side of the equation.
-1R + -3r + 3r + rR = 12 + 3r

Combine like terms: -3r + 3r = 0
-1R + 0 + rR = 12 + 3r
-1R + rR = 12 + 3r

Reorder the terms:
-12 + -1R + -3r + rR = 12 + 3r + -12 + -3r

Reorder the terms:
-12 + -1R + -3r + rR = 12 + -12 + 3r + -3r

Combine like terms: 12 + -12 = 0
-12 + -1R + -3r + rR = 0 + 3r + -3r
-12 + -1R + -3r + rR = 3r + -3r

Combine like terms: 3r + -3r = 0
-12 + -1R + -3r + rR = 0

The solution to this equation could not be determined.

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