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Simplifying 21 + 5r = 4(9r + 7) Reorder the terms: 21 + 5r = 4(7 + 9r) 21 + 5r = (7 * 4 + 9r * 4) 21 + 5r = (28 + 36r) Solving 21 + 5r = 28 + 36r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-36r' to each side of the equation. 21 + 5r + -36r = 28 + 36r + -36r Combine like terms: 5r + -36r = -31r 21 + -31r = 28 + 36r + -36r Combine like terms: 36r + -36r = 0 21 + -31r = 28 + 0 21 + -31r = 28 Add '-21' to each side of the equation. 21 + -21 + -31r = 28 + -21 Combine like terms: 21 + -21 = 0 0 + -31r = 28 + -21 -31r = 28 + -21 Combine like terms: 28 + -21 = 7 -31r = 7 Divide each side by '-31'. r = -0.2258064516 Simplifying r = -0.2258064516
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