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Simplifying 7 + -9(5r + -4) = 47 Reorder the terms: 7 + -9(-4 + 5r) = 47 7 + (-4 * -9 + 5r * -9) = 47 7 + (36 + -45r) = 47 Combine like terms: 7 + 36 = 43 43 + -45r = 47 Solving 43 + -45r = 47 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-43' to each side of the equation. 43 + -43 + -45r = 47 + -43 Combine like terms: 43 + -43 = 0 0 + -45r = 47 + -43 -45r = 47 + -43 Combine like terms: 47 + -43 = 4 -45r = 4 Divide each side by '-45'. r = -0.08888888889 Simplifying r = -0.08888888889
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