12-4(r+12)=20

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Solution for 12-4(r+12)=20 equation:


Simplifying
12 + -4(r + 12) = 20

Reorder the terms:
12 + -4(12 + r) = 20
12 + (12 * -4 + r * -4) = 20
12 + (-48 + -4r) = 20

Combine like terms: 12 + -48 = -36
-36 + -4r = 20

Solving
-36 + -4r = 20

Solving for variable 'r'.

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

Add '36' to each side of the equation.
-36 + 36 + -4r = 20 + 36

Combine like terms: -36 + 36 = 0
0 + -4r = 20 + 36
-4r = 20 + 36

Combine like terms: 20 + 36 = 56
-4r = 56

Divide each side by '-4'.
r = -14

Simplifying
r = -14

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