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Simplifying -3(r + 7) = -4 Reorder the terms: -3(7 + r) = -4 (7 * -3 + r * -3) = -4 (-21 + -3r) = -4 Solving -21 + -3r = -4 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 = -4 + 21 Combine like terms: -21 + 21 = 0 0 + -3r = -4 + 21 -3r = -4 + 21 Combine like terms: -4 + 21 = 17 -3r = 17 Divide each side by '-3'. r = -5.666666667 Simplifying r = -5.666666667
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