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Simplifying -9(3r + 7) + 4r = 23 Reorder the terms: -9(7 + 3r) + 4r = 23 (7 * -9 + 3r * -9) + 4r = 23 (-63 + -27r) + 4r = 23 Combine like terms: -27r + 4r = -23r -63 + -23r = 23 Solving -63 + -23r = 23 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + -23r = 23 + 63 Combine like terms: -63 + 63 = 0 0 + -23r = 23 + 63 -23r = 23 + 63 Combine like terms: 23 + 63 = 86 -23r = 86 Divide each side by '-23'. r = -3.739130435 Simplifying r = -3.739130435
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