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Simplifying 13 + -4(2r + -3) = -13 Reorder the terms: 13 + -4(-3 + 2r) = -13 13 + (-3 * -4 + 2r * -4) = -13 13 + (12 + -8r) = -13 Combine like terms: 13 + 12 = 25 25 + -8r = -13 Solving 25 + -8r = -13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + -8r = -13 + -25 Combine like terms: 25 + -25 = 0 0 + -8r = -13 + -25 -8r = -13 + -25 Combine like terms: -13 + -25 = -38 -8r = -38 Divide each side by '-8'. r = 4.75 Simplifying r = 4.75
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