300=400-20r

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Solution for 300=400-20r equation:


Simplifying
300 = 400 + -20r

Solving
300 = 400 + -20r

Solving for variable 'r'.

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

Add '20r' to each side of the equation.
300 + 20r = 400 + -20r + 20r

Combine like terms: -20r + 20r = 0
300 + 20r = 400 + 0
300 + 20r = 400

Add '-300' to each side of the equation.
300 + -300 + 20r = 400 + -300

Combine like terms: 300 + -300 = 0
0 + 20r = 400 + -300
20r = 400 + -300

Combine like terms: 400 + -300 = 100
20r = 100

Divide each side by '20'.
r = 5

Simplifying
r = 5

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