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Simplifying 4(r + 20) = 0.20(20r + 400) Reorder the terms: 4(20 + r) = 0.20(20r + 400) (20 * 4 + r * 4) = 0.20(20r + 400) (80 + 4r) = 0.20(20r + 400) Reorder the terms: 80 + 4r = 0.20(400 + 20r) 80 + 4r = (400 * 0.20 + 20r * 0.20) 80 + 4r = (80 + 4r) Add '-80' to each side of the equation. 80 + -80 + 4r = 80 + -80 + 4r Combine like terms: 80 + -80 = 0 0 + 4r = 80 + -80 + 4r 4r = 80 + -80 + 4r Combine like terms: 80 + -80 = 0 4r = 0 + 4r 4r = 4r Add '-4r' to each side of the equation. 4r + -4r = 4r + -4r Combine like terms: 4r + -4r = 0 0 = 4r + -4r Combine like terms: 4r + -4r = 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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