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Simplifying 21 = r + 18 Reorder the terms: 21 = 18 + r Solving 21 = 18 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 21 + -1r = 18 + r + -1r Combine like terms: r + -1r = 0 21 + -1r = 18 + 0 21 + -1r = 18 Add '-21' to each side of the equation. 21 + -21 + -1r = 18 + -21 Combine like terms: 21 + -21 = 0 0 + -1r = 18 + -21 -1r = 18 + -21 Combine like terms: 18 + -21 = -3 -1r = -3 Divide each side by '-1'. r = 3 Simplifying r = 3
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