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Simplifying 21 + -7t + 3r + -1rt = 0 Reorder the terms: 21 + 3r + -1rt + -7t = 0 Solving 21 + 3r + -1rt + -7t = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 3r + -1rt + -21 + -7t = 0 + -21 Reorder the terms: 21 + -21 + 3r + -1rt + -7t = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3r + -1rt + -7t = 0 + -21 3r + -1rt + -7t = 0 + -21 Combine like terms: 0 + -21 = -21 3r + -1rt + -7t = -21 Add '7t' to each side of the equation. 3r + -1rt + -7t + 7t = -21 + 7t Combine like terms: -7t + 7t = 0 3r + -1rt + 0 = -21 + 7t 3r + -1rt = -21 + 7t Reorder the terms: 21 + 3r + -1rt + -7t = -21 + 7t + 21 + -7t Reorder the terms: 21 + 3r + -1rt + -7t = -21 + 21 + 7t + -7t Combine like terms: -21 + 21 = 0 21 + 3r + -1rt + -7t = 0 + 7t + -7t 21 + 3r + -1rt + -7t = 7t + -7t Combine like terms: 7t + -7t = 0 21 + 3r + -1rt + -7t = 0 The solution to this equation could not be determined.
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