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Simplifying 23 = r + -1(-21) Multiply -1 * -21 23 = r + 21 Reorder the terms: 23 = 21 + r Solving 23 = 21 + 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. 23 + -1r = 21 + r + -1r Combine like terms: r + -1r = 0 23 + -1r = 21 + 0 23 + -1r = 21 Add '-23' to each side of the equation. 23 + -23 + -1r = 21 + -23 Combine like terms: 23 + -23 = 0 0 + -1r = 21 + -23 -1r = 21 + -23 Combine like terms: 21 + -23 = -2 -1r = -2 Divide each side by '-1'. r = 2 Simplifying r = 2
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