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Simplifying 15r + -10 + -1(-1r) + 5r + 3 = 0 Remove parenthesis around (-1r) 15r + -10 + -1 * -1r + 5r + 3 = 0 Multiply -1 * -1 15r + -10 + 1r + 5r + 3 = 0 Reorder the terms: -10 + 3 + 15r + 1r + 5r = 0 Combine like terms: -10 + 3 = -7 -7 + 15r + 1r + 5r = 0 Combine like terms: 15r + 1r = 16r -7 + 16r + 5r = 0 Combine like terms: 16r + 5r = 21r -7 + 21r = 0 Solving -7 + 21r = 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 + 21r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 21r = 0 + 7 21r = 0 + 7 Combine like terms: 0 + 7 = 7 21r = 7 Divide each side by '21'. r = 0.3333333333 Simplifying r = 0.3333333333
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