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Simplifying [-2r][8] + [-25] = 0 Remove brackets around [-2r] -2r[8] + [-25] = 0 Reorder the terms for easier multiplication: -2 * 8r + [-25] = 0 Multiply -2 * 8 -16r + [-25] = 0 -16r + -25 = 0 Reorder the terms: -25 + -16r = 0 Solving -25 + -16r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + -16r = 0 + 25 Combine like terms: -25 + 25 = 0 0 + -16r = 0 + 25 -16r = 0 + 25 Combine like terms: 0 + 25 = 25 -16r = 25 Divide each side by '-16'. r = -1.5625 Simplifying r = -1.5625
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