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Simplifying 15r + -10 + -1(-7r) + 5r + 3 = 0 Remove parenthesis around (-7r) 15r + -10 + -1 * -7r + 5r + 3 = 0 Multiply -1 * -7 15r + -10 + 7r + 5r + 3 = 0 Reorder the terms: -10 + 3 + 15r + 7r + 5r = 0 Combine like terms: -10 + 3 = -7 -7 + 15r + 7r + 5r = 0 Combine like terms: 15r + 7r = 22r -7 + 22r + 5r = 0 Combine like terms: 22r + 5r = 27r -7 + 27r = 0 Solving -7 + 27r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 27r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 27r = 0 + 7 27r = 0 + 7 Combine like terms: 0 + 7 = 7 27r = 7 Divide each side by '27'. r = 0.2592592593 Simplifying r = 0.2592592593
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