40=50-r(50)

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Solution for 40=50-r(50) equation:


Simplifying
40 = 50 + -1r(50)

Reorder the terms for easier multiplication:
40 = 50 + -1 * 50r

Multiply -1 * 50
40 = 50 + -50r

Solving
40 = 50 + -50r

Solving for variable 'r'.

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

Add '50r' to each side of the equation.
40 + 50r = 50 + -50r + 50r

Combine like terms: -50r + 50r = 0
40 + 50r = 50 + 0
40 + 50r = 50

Add '-40' to each side of the equation.
40 + -40 + 50r = 50 + -40

Combine like terms: 40 + -40 = 0
0 + 50r = 50 + -40
50r = 50 + -40

Combine like terms: 50 + -40 = 10
50r = 10

Divide each side by '50'.
r = 0.2

Simplifying
r = 0.2

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