3r+2(r-4)=12

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Solution for 3r+2(r-4)=12 equation:


Simplifying
3r + 2(r + -4) = 12

Reorder the terms:
3r + 2(-4 + r) = 12
3r + (-4 * 2 + r * 2) = 12
3r + (-8 + 2r) = 12

Reorder the terms:
-8 + 3r + 2r = 12

Combine like terms: 3r + 2r = 5r
-8 + 5r = 12

Solving
-8 + 5r = 12

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + 5r = 12 + 8

Combine like terms: -8 + 8 = 0
0 + 5r = 12 + 8
5r = 12 + 8

Combine like terms: 12 + 8 = 20
5r = 20

Divide each side by '5'.
r = 4

Simplifying
r = 4

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