20(-0.4r)=20(-0.45r)

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Solution for 20(-0.4r)=20(-0.45r) equation:


Simplifying
20(-0.4r) = 20(-0.45r)

Remove parenthesis around (-0.4r)
20 * -0.4r = 20(-0.45r)

Multiply 20 * -0.4
-8r = 20(-0.45r)

Remove parenthesis around (-0.45r)
-8r = 20 * -0.45r

Multiply 20 * -0.45
-8r = -9r

Solving
-8r = -9r

Solving for variable 'r'.

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

Add '9r' to each side of the equation.
-8r + 9r = -9r + 9r

Combine like terms: -8r + 9r = 1r
1r = -9r + 9r

Combine like terms: -9r + 9r = 0
1r = 0

Divide each side by '1'.
r = 0

Simplifying
r = 0

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