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Simplifying 28 = t(r + 4) Reorder the terms: 28 = t(4 + r) 28 = (4 * t + r * t) Reorder the terms: 28 = (rt + 4t) 28 = (rt + 4t) Solving 28 = rt + 4t Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1rt' to each side of the equation. 28 + -1rt = rt + -1rt + 4t Combine like terms: rt + -1rt = 0 28 + -1rt = 0 + 4t 28 + -1rt = 4t Add '-28' to each side of the equation. 28 + -28 + -1rt = -28 + 4t Combine like terms: 28 + -28 = 0 0 + -1rt = -28 + 4t -1rt = -28 + 4t Divide each side by '-1t'. r = 28t-1 + -4 Simplifying r = 28t-1 + -4 Reorder the terms: r = -4 + 28t-1
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