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Simplifying 15(t + -6) + 6t = 7(3t + 2) + -9 Reorder the terms: 15(-6 + t) + 6t = 7(3t + 2) + -9 (-6 * 15 + t * 15) + 6t = 7(3t + 2) + -9 (-90 + 15t) + 6t = 7(3t + 2) + -9 Combine like terms: 15t + 6t = 21t -90 + 21t = 7(3t + 2) + -9 Reorder the terms: -90 + 21t = 7(2 + 3t) + -9 -90 + 21t = (2 * 7 + 3t * 7) + -9 -90 + 21t = (14 + 21t) + -9 Reorder the terms: -90 + 21t = 14 + -9 + 21t Combine like terms: 14 + -9 = 5 -90 + 21t = 5 + 21t Add '-21t' to each side of the equation. -90 + 21t + -21t = 5 + 21t + -21t Combine like terms: 21t + -21t = 0 -90 + 0 = 5 + 21t + -21t -90 = 5 + 21t + -21t Combine like terms: 21t + -21t = 0 -90 = 5 + 0 -90 = 5 Solving -90 = 5 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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