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Simplifying 19 = r + -1(-9) Multiply -1 * -9 19 = r + 9 Reorder the terms: 19 = 9 + r Solving 19 = 9 + 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. 19 + -1r = 9 + r + -1r Combine like terms: r + -1r = 0 19 + -1r = 9 + 0 19 + -1r = 9 Add '-19' to each side of the equation. 19 + -19 + -1r = 9 + -19 Combine like terms: 19 + -19 = 0 0 + -1r = 9 + -19 -1r = 9 + -19 Combine like terms: 9 + -19 = -10 -1r = -10 Divide each side by '-1'. r = 10 Simplifying r = 10
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