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Simplifying 21 = 3(7 + 5r) 21 = (7 * 3 + 5r * 3) 21 = (21 + 15r) Add '-21' to each side of the equation. 21 + -21 = 21 + -21 + 15r Combine like terms: 21 + -21 = 0 0 = 21 + -21 + 15r Combine like terms: 21 + -21 = 0 0 = 0 + 15r 0 = 15r Solving 0 = 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. 0 + -15r = 15r + -15r Remove the zero: -15r = 15r + -15r Combine like terms: 15r + -15r = 0 -15r = 0 Divide each side by '-15'. r = 0 Simplifying r = 0
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