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Simplifying -63 = -4(r + 6) Reorder the terms: -63 = -4(6 + r) -63 = (6 * -4 + r * -4) -63 = (-24 + -4r) Solving -63 = -24 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -63 + 4r = -24 + -4r + 4r Combine like terms: -4r + 4r = 0 -63 + 4r = -24 + 0 -63 + 4r = -24 Add '63' to each side of the equation. -63 + 63 + 4r = -24 + 63 Combine like terms: -63 + 63 = 0 0 + 4r = -24 + 63 4r = -24 + 63 Combine like terms: -24 + 63 = 39 4r = 39 Divide each side by '4'. r = 9.75 Simplifying r = 9.75
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