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Simplifying 23 = r + -1(-7) Multiply -1 * -7 23 = r + 7 Reorder the terms: 23 = 7 + r Solving 23 = 7 + 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 = 7 + r + -1r Combine like terms: r + -1r = 0 23 + -1r = 7 + 0 23 + -1r = 7 Add '-23' to each side of the equation. 23 + -23 + -1r = 7 + -23 Combine like terms: 23 + -23 = 0 0 + -1r = 7 + -23 -1r = 7 + -23 Combine like terms: 7 + -23 = -16 -1r = -16 Divide each side by '-1'. r = 16 Simplifying r = 16
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