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Simplifying -3(r + 7) = -40 Reorder the terms: -3(7 + r) = -40 (7 * -3 + r * -3) = -40 (-21 + -3r) = -40 Solving -21 + -3r = -40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -3r = -40 + 21 Combine like terms: -21 + 21 = 0 0 + -3r = -40 + 21 -3r = -40 + 21 Combine like terms: -40 + 21 = -19 -3r = -19 Divide each side by '-3'. r = 6.333333333 Simplifying r = 6.333333333
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