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Simplifying 4.3r + -7.4(3.9 + -1.9r) = -172.068 4.3r + (3.9 * -7.4 + -1.9r * -7.4) = -172.068 4.3r + (-28.86 + 14.06r) = -172.068 Reorder the terms: -28.86 + 4.3r + 14.06r = -172.068 Combine like terms: 4.3r + 14.06r = 18.36r -28.86 + 18.36r = -172.068 Solving -28.86 + 18.36r = -172.068 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '28.86' to each side of the equation. -28.86 + 28.86 + 18.36r = -172.068 + 28.86 Combine like terms: -28.86 + 28.86 = 0.00 0.00 + 18.36r = -172.068 + 28.86 18.36r = -172.068 + 28.86 Combine like terms: -172.068 + 28.86 = -143.208 18.36r = -143.208 Divide each side by '18.36'. r = -7.8 Simplifying r = -7.8
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