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

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


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

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

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

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

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

Combine like terms: -8 + -12 = -20
-20 + 4r + -3r = 0

Combine like terms: 4r + -3r = 1r
-20 + 1r = 0

Solving
-20 + 1r = 0

Solving for variable 'r'.

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

Add '20' to each side of the equation.
-20 + 20 + 1r = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 1r = 0 + 20
1r = 0 + 20

Combine like terms: 0 + 20 = 20
1r = 20

Divide each side by '1'.
r = 20

Simplifying
r = 20

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