7r+2(r-4)-4r=-12

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Solution for 7r+2(r-4)-4r=-12 equation:


Simplifying
7r + 2(r + -4) + -4r = -12

Reorder the terms:
7r + 2(-4 + r) + -4r = -12
7r + (-4 * 2 + r * 2) + -4r = -12
7r + (-8 + 2r) + -4r = -12

Reorder the terms:
-8 + 7r + 2r + -4r = -12

Combine like terms: 7r + 2r = 9r
-8 + 9r + -4r = -12

Combine like terms: 9r + -4r = 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 = -4
5r = -4

Divide each side by '5'.
r = -0.8

Simplifying
r = -0.8

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