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Simplifying 81 = r + -1(47) Multiply -1 * 47 81 = r + -47 Reorder the terms: 81 = -47 + r Solving 81 = -47 + 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. 81 + -1r = -47 + r + -1r Combine like terms: r + -1r = 0 81 + -1r = -47 + 0 81 + -1r = -47 Add '-81' to each side of the equation. 81 + -81 + -1r = -47 + -81 Combine like terms: 81 + -81 = 0 0 + -1r = -47 + -81 -1r = -47 + -81 Combine like terms: -47 + -81 = -128 -1r = -128 Divide each side by '-1'. r = 128 Simplifying r = 128
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