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Simplifying 21 + 3r + -5r = 20r + -5r + 8 Combine like terms: 3r + -5r = -2r 21 + -2r = 20r + -5r + 8 Reorder the terms: 21 + -2r = 8 + 20r + -5r Combine like terms: 20r + -5r = 15r 21 + -2r = 8 + 15r Solving 21 + -2r = 8 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 21 + -2r + -15r = 8 + 15r + -15r Combine like terms: -2r + -15r = -17r 21 + -17r = 8 + 15r + -15r Combine like terms: 15r + -15r = 0 21 + -17r = 8 + 0 21 + -17r = 8 Add '-21' to each side of the equation. 21 + -21 + -17r = 8 + -21 Combine like terms: 21 + -21 = 0 0 + -17r = 8 + -21 -17r = 8 + -21 Combine like terms: 8 + -21 = -13 -17r = -13 Divide each side by '-17'. r = 0.7647058824 Simplifying r = 0.7647058824
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