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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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