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Simplifying 8 = r + -1(-18) Multiply -1 * -18 8 = r + 18 Reorder the terms: 8 = 18 + r Solving 8 = 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. 8 + -1r = 18 + r + -1r Combine like terms: r + -1r = 0 8 + -1r = 18 + 0 8 + -1r = 18 Add '-8' to each side of the equation. 8 + -8 + -1r = 18 + -8 Combine like terms: 8 + -8 = 0 0 + -1r = 18 + -8 -1r = 18 + -8 Combine like terms: 18 + -8 = 10 -1r = 10 Divide each side by '-1'. r = -10 Simplifying r = -10
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