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Simplifying -7 + 8(4r + 6) = -215 Reorder the terms: -7 + 8(6 + 4r) = -215 -7 + (6 * 8 + 4r * 8) = -215 -7 + (48 + 32r) = -215 Combine like terms: -7 + 48 = 41 41 + 32r = -215 Solving 41 + 32r = -215 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-41' to each side of the equation. 41 + -41 + 32r = -215 + -41 Combine like terms: 41 + -41 = 0 0 + 32r = -215 + -41 32r = -215 + -41 Combine like terms: -215 + -41 = -256 32r = -256 Divide each side by '32'. r = -8 Simplifying r = -8
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