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Simplifying -3r + -4(r + 3) = 1 Reorder the terms: -3r + -4(3 + r) = 1 -3r + (3 * -4 + r * -4) = 1 -3r + (-12 + -4r) = 1 Reorder the terms: -12 + -3r + -4r = 1 Combine like terms: -3r + -4r = -7r -12 + -7r = 1 Solving -12 + -7r = 1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -7r = 1 + 12 Combine like terms: -12 + 12 = 0 0 + -7r = 1 + 12 -7r = 1 + 12 Combine like terms: 1 + 12 = 13 -7r = 13 Divide each side by '-7'. r = -1.857142857 Simplifying r = -1.857142857
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