4[r+20]=2r+40

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Solution for 4[r+20]=2r+40 equation:


Simplifying
4[r + 20] = 2r + 40

Reorder the terms:
4[20 + r] = 2r + 40
[20 * 4 + r * 4] = 2r + 40
[80 + 4r] = 2r + 40

Reorder the terms:
80 + 4r = 40 + 2r

Solving
80 + 4r = 40 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
80 + 4r + -2r = 40 + 2r + -2r

Combine like terms: 4r + -2r = 2r
80 + 2r = 40 + 2r + -2r

Combine like terms: 2r + -2r = 0
80 + 2r = 40 + 0
80 + 2r = 40

Add '-80' to each side of the equation.
80 + -80 + 2r = 40 + -80

Combine like terms: 80 + -80 = 0
0 + 2r = 40 + -80
2r = 40 + -80

Combine like terms: 40 + -80 = -40
2r = -40

Divide each side by '2'.
r = -20

Simplifying
r = -20

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