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Simplifying 12 + -7(3 + -5r) + 8r = 0 12 + (3 * -7 + -5r * -7) + 8r = 0 12 + (-21 + 35r) + 8r = 0 Combine like terms: 12 + -21 = -9 -9 + 35r + 8r = 0 Combine like terms: 35r + 8r = 43r -9 + 43r = 0 Solving -9 + 43r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 43r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 43r = 0 + 9 43r = 0 + 9 Combine like terms: 0 + 9 = 9 43r = 9 Divide each side by '43'. r = 0.2093023256 Simplifying r = 0.2093023256
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