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Simplifying 42r + -2(13 + -5r) + 7 = 15 42r + (13 * -2 + -5r * -2) + 7 = 15 42r + (-26 + 10r) + 7 = 15 Reorder the terms: -26 + 7 + 42r + 10r = 15 Combine like terms: -26 + 7 = -19 -19 + 42r + 10r = 15 Combine like terms: 42r + 10r = 52r -19 + 52r = 15 Solving -19 + 52r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + 52r = 15 + 19 Combine like terms: -19 + 19 = 0 0 + 52r = 15 + 19 52r = 15 + 19 Combine like terms: 15 + 19 = 34 52r = 34 Divide each side by '52'. r = 0.6538461538 Simplifying r = 0.6538461538
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