.5(r-12)=4

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Solution for .5(r-12)=4 equation: 


Simplifying
0.5(r + -12) = 4

Reorder the terms:
0.5(-12 + r) = 4
(-12 * 0.5 + r * 0.5) = 4
(-6 + 0.5r) = 4

Solving
-6 + 0.5r = 4

Solving for variable 'r'.

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

Add '6' to each side of the equation.
-6 + 6 + 0.5r = 4 + 6

Combine like terms: -6 + 6 = 0
0 + 0.5r = 4 + 6
0.5r = 4 + 6

Combine like terms: 4 + 6 = 10
0.5r = 10

Divide each side by '0.5'.
r = 20

Simplifying
r = 20

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