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Simplifying (9r + -4)(9t + 4) = 0 Reorder the terms: (-4 + 9r)(9t + 4) = 0 Reorder the terms: (-4 + 9r)(4 + 9t) = 0 Multiply (-4 + 9r) * (4 + 9t) (-4(4 + 9t) + 9r * (4 + 9t)) = 0 ((4 * -4 + 9t * -4) + 9r * (4 + 9t)) = 0 ((-16 + -36t) + 9r * (4 + 9t)) = 0 (-16 + -36t + (4 * 9r + 9t * 9r)) = 0 (-16 + -36t + (36r + 81rt)) = 0 Reorder the terms: (-16 + 36r + 81rt + -36t) = 0 (-16 + 36r + 81rt + -36t) = 0 Solving -16 + 36r + 81rt + -36t = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 36r + 81rt + 16 + -36t = 0 + 16 Reorder the terms: -16 + 16 + 36r + 81rt + -36t = 0 + 16 Combine like terms: -16 + 16 = 0 0 + 36r + 81rt + -36t = 0 + 16 36r + 81rt + -36t = 0 + 16 Combine like terms: 0 + 16 = 16 36r + 81rt + -36t = 16 Add '36t' to each side of the equation. 36r + 81rt + -36t + 36t = 16 + 36t Combine like terms: -36t + 36t = 0 36r + 81rt + 0 = 16 + 36t 36r + 81rt = 16 + 36t Reorder the terms: -16 + 36r + 81rt + -36t = 16 + 36t + -16 + -36t Reorder the terms: -16 + 36r + 81rt + -36t = 16 + -16 + 36t + -36t Combine like terms: 16 + -16 = 0 -16 + 36r + 81rt + -36t = 0 + 36t + -36t -16 + 36r + 81rt + -36t = 36t + -36t Combine like terms: 36t + -36t = 0 -16 + 36r + 81rt + -36t = 0 The solution to this equation could not be determined.
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