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Simplifying 8(r + -8) + 4r = -215 Reorder the terms: 8(-8 + r) + 4r = -215 (-8 * 8 + r * 8) + 4r = -215 (-64 + 8r) + 4r = -215 Combine like terms: 8r + 4r = 12r -64 + 12r = -215 Solving -64 + 12r = -215 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '64' to each side of the equation. -64 + 64 + 12r = -215 + 64 Combine like terms: -64 + 64 = 0 0 + 12r = -215 + 64 12r = -215 + 64 Combine like terms: -215 + 64 = -151 12r = -151 Divide each side by '12'. r = -12.58333333 Simplifying r = -12.58333333
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