4(r+20)=0.10(20r+400)

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Solution for 4(r+20)=0.10(20r+400) equation:


Simplifying
4(r + 20) = 0.10(20r + 400)

Reorder the terms:
4(20 + r) = 0.10(20r + 400)
(20 * 4 + r * 4) = 0.10(20r + 400)
(80 + 4r) = 0.10(20r + 400)

Reorder the terms:
80 + 4r = 0.10(400 + 20r)
80 + 4r = (400 * 0.10 + 20r * 0.10)
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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