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Simplifying 42r + -1(13 + -5r) + 7 = 85 42r + (13 * -1 + -5r * -1) + 7 = 85 42r + (-13 + 5r) + 7 = 85 Reorder the terms: -13 + 7 + 42r + 5r = 85 Combine like terms: -13 + 7 = -6 -6 + 42r + 5r = 85 Combine like terms: 42r + 5r = 47r -6 + 47r = 85 Solving -6 + 47r = 85 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 47r = 85 + 6 Combine like terms: -6 + 6 = 0 0 + 47r = 85 + 6 47r = 85 + 6 Combine like terms: 85 + 6 = 91 47r = 91 Divide each side by '47'. r = 1.936170213 Simplifying r = 1.936170213
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