r-4+r=12

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Solution for r-4+r=12 equation: 


Simplifying
r + -4 + r = 12

Reorder the terms:
-4 + r + r = 12

Combine like terms: r + r = 2r
-4 + 2r = 12

Solving
-4 + 2r = 12

Solving for variable 'r'.

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

Add '4' to each side of the equation.
-4 + 4 + 2r = 12 + 4

Combine like terms: -4 + 4 = 0
0 + 2r = 12 + 4
2r = 12 + 4

Combine like terms: 12 + 4 = 16
2r = 16

Divide each side by '2'.
r = 8

Simplifying
r = 8

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