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Simplifying 20(1) + 0.30(25) = r Multiply 20 * 1 20 + 0.30(25) = r Multiply 0.30 * 25 20 + 7.5 = r Combine like terms: 20 + 7.5 = 27.5 27.5 = r Solving 27.5 = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 27.5 + -1r = r + -1r Combine like terms: r + -1r = 0 27.5 + -1r = 0 Add '-27.5' to each side of the equation. 27.5 + -27.5 + -1r = 0 + -27.5 Combine like terms: 27.5 + -27.5 = 0.0 0.0 + -1r = 0 + -27.5 -1r = 0 + -27.5 Combine like terms: 0 + -27.5 = -27.5 -1r = -27.5 Divide each side by '-1'. r = 27.5 Simplifying r = 27.5
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