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Simplifying 13r + -5(2r + -5t) + -4t = 3 13r + (2r * -5 + -5t * -5) + -4t = 3 13r + (-10r + 25t) + -4t = 3 Combine like terms: 13r + -10r = 3r 3r + 25t + -4t = 3 Combine like terms: 25t + -4t = 21t 3r + 21t = 3 Solving 3r + 21t = 3 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21t' to each side of the equation. 3r + 21t + -21t = 3 + -21t Combine like terms: 21t + -21t = 0 3r + 0 = 3 + -21t 3r = 3 + -21t Divide each side by '3'. r = 1 + -7t Simplifying r = 1 + -7t
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