(4r-8)-(3+12)=0

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Solution for (4r-8)-(3+12)=0 equation:


Simplifying
(4r + -8) + -1(3 + 12) = 0

Reorder the terms:
(-8 + 4r) + -1(3 + 12) = 0

Remove parenthesis around (-8 + 4r)
-8 + 4r + -1(3 + 12) = 0

Combine like terms: 3 + 12 = 15
-8 + 4r + -1(15) = 0

Multiply -1 * 15
-8 + 4r + -15 = 0

Reorder the terms:
-8 + -15 + 4r = 0

Combine like terms: -8 + -15 = -23
-23 + 4r = 0

Solving
-23 + 4r = 0

Solving for variable 'r'.

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

Add '23' to each side of the equation.
-23 + 23 + 4r = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 4r = 0 + 23
4r = 0 + 23

Combine like terms: 0 + 23 = 23
4r = 23

Divide each side by '4'.
r = 5.75

Simplifying
r = 5.75

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