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Simplifying 8 = 4(r + 9) Reorder the terms: 8 = 4(9 + r) 8 = (9 * 4 + r * 4) 8 = (36 + 4r) Solving 8 = 36 + 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. 8 + -4r = 36 + 4r + -4r Combine like terms: 4r + -4r = 0 8 + -4r = 36 + 0 8 + -4r = 36 Add '-8' to each side of the equation. 8 + -8 + -4r = 36 + -8 Combine like terms: 8 + -8 = 0 0 + -4r = 36 + -8 -4r = 36 + -8 Combine like terms: 36 + -8 = 28 -4r = 28 Divide each side by '-4'. r = -7 Simplifying r = -7
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