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Simplifying 5[4 + r] = 0.50[40 + 10r] [4 * 5 + r * 5] = 0.50[40 + 10r] [20 + 5r] = 0.50[40 + 10r] 20 + 5r = [40 * 0.50 + 10r * 0.50] 20 + 5r = [20 + 5r] Add '-20' to each side of the equation. 20 + -20 + 5r = 20 + -20 + 5r Combine like terms: 20 + -20 = 0 0 + 5r = 20 + -20 + 5r 5r = 20 + -20 + 5r Combine like terms: 20 + -20 = 0 5r = 0 + 5r 5r = 5r Add '-5r' to each side of the equation. 5r + -5r = 5r + -5r Combine like terms: 5r + -5r = 0 0 = 5r + -5r Combine like terms: 5r + -5r = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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