2r+2(r+2)=84

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Solution for 2r+2(r+2)=84 equation:


Simplifying
2r + 2(r + 2) = 84

Reorder the terms:
2r + 2(2 + r) = 84
2r + (2 * 2 + r * 2) = 84
2r + (4 + 2r) = 84

Reorder the terms:
4 + 2r + 2r = 84

Combine like terms: 2r + 2r = 4r
4 + 4r = 84

Solving
4 + 4r = 84

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + 4r = 84 + -4

Combine like terms: 4 + -4 = 0
0 + 4r = 84 + -4
4r = 84 + -4

Combine like terms: 84 + -4 = 80
4r = 80

Divide each side by '4'.
r = 20

Simplifying
r = 20

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