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Simplifying -5 + -7(5 + -7r) = -89 -5 + (5 * -7 + -7r * -7) = -89 -5 + (-35 + 49r) = -89 Combine like terms: -5 + -35 = -40 -40 + 49r = -89 Solving -40 + 49r = -89 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + 49r = -89 + 40 Combine like terms: -40 + 40 = 0 0 + 49r = -89 + 40 49r = -89 + 40 Combine like terms: -89 + 40 = -49 49r = -49 Divide each side by '49'. r = -1 Simplifying r = -1
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