4(5-r)+5(r+4)=40

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Solution for 4(5-r)+5(r+4)=40 equation:


Simplifying
4(5 + -1r) + 5(r + 4) = 40
(5 * 4 + -1r * 4) + 5(r + 4) = 40
(20 + -4r) + 5(r + 4) = 40

Reorder the terms:
20 + -4r + 5(4 + r) = 40
20 + -4r + (4 * 5 + r * 5) = 40
20 + -4r + (20 + 5r) = 40

Reorder the terms:
20 + 20 + -4r + 5r = 40

Combine like terms: 20 + 20 = 40
40 + -4r + 5r = 40

Combine like terms: -4r + 5r = 1r
40 + 1r = 40

Add '-40' to each side of the equation.
40 + -40 + 1r = 40 + -40

Combine like terms: 40 + -40 = 0
0 + 1r = 40 + -40
1r = 40 + -40

Combine like terms: 40 + -40 = 0
1r = 0

Solving
1r = 0

Solving for variable 'r'.

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

Divide each side by '1'.
r = 0

Simplifying
r = 0

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