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Simplifying -4r + -7(2 + 3r) = 0 -4r + (2 * -7 + 3r * -7) = 0 -4r + (-14 + -21r) = 0 Reorder the terms: -14 + -4r + -21r = 0 Combine like terms: -4r + -21r = -25r -14 + -25r = 0 Solving -14 + -25r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + -25r = 0 + 14 Combine like terms: -14 + 14 = 0 0 + -25r = 0 + 14 -25r = 0 + 14 Combine like terms: 0 + 14 = 14 -25r = 14 Divide each side by '-25'. r = -0.56 Simplifying r = -0.56
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