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Simplifying 13 + 2(4r + -3) = -8 Reorder the terms: 13 + 2(-3 + 4r) = -8 13 + (-3 * 2 + 4r * 2) = -8 13 + (-6 + 8r) = -8 Combine like terms: 13 + -6 = 7 7 + 8r = -8 Solving 7 + 8r = -8 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 + 8r = -8 + -7 Combine like terms: 7 + -7 = 0 0 + 8r = -8 + -7 8r = -8 + -7 Combine like terms: -8 + -7 = -15 8r = -15 Divide each side by '8'. r = -1.875 Simplifying r = -1.875
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