4(r+20)=5(r-20)

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Solution for 4(r+20)=5(r-20) equation:


Simplifying
4(r + 20) = 5(r + -20)

Reorder the terms:
4(20 + r) = 5(r + -20)
(20 * 4 + r * 4) = 5(r + -20)
(80 + 4r) = 5(r + -20)

Reorder the terms:
80 + 4r = 5(-20 + r)
80 + 4r = (-20 * 5 + r * 5)
80 + 4r = (-100 + 5r)

Solving
80 + 4r = -100 + 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
80 + 4r + -5r = -100 + 5r + -5r

Combine like terms: 4r + -5r = -1r
80 + -1r = -100 + 5r + -5r

Combine like terms: 5r + -5r = 0
80 + -1r = -100 + 0
80 + -1r = -100

Add '-80' to each side of the equation.
80 + -80 + -1r = -100 + -80

Combine like terms: 80 + -80 = 0
0 + -1r = -100 + -80
-1r = -100 + -80

Combine like terms: -100 + -80 = -180
-1r = -180

Divide each side by '-1'.
r = 180

Simplifying
r = 180

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