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Simplifying 28 = t(r + 4) * t Reorder the terms: 28 = t(4 + r) * t Reorder the terms for easier multiplication: 28 = t * t(4 + r) Multiply t * t 28 = t2(4 + r) 28 = (4 * t2 + r * t2) Reorder the terms: 28 = (rt2 + 4t2) 28 = (rt2 + 4t2) Solving 28 = rt2 + 4t2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1rt2' to each side of the equation. 28 + -1rt2 = rt2 + -1rt2 + 4t2 Combine like terms: rt2 + -1rt2 = 0 28 + -1rt2 = 0 + 4t2 28 + -1rt2 = 4t2 Add '-28' to each side of the equation. 28 + -28 + -1rt2 = -28 + 4t2 Combine like terms: 28 + -28 = 0 0 + -1rt2 = -28 + 4t2 -1rt2 = -28 + 4t2 Divide each side by '-1t2'. r = 28t-2 + -4 Simplifying r = 28t-2 + -4 Reorder the terms: r = -4 + 28t-2
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