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Simplifying 7s + -1(3s + 1) = 4(3 + s) Reorder the terms: 7s + -1(1 + 3s) = 4(3 + s) 7s + (1 * -1 + 3s * -1) = 4(3 + s) 7s + (-1 + -3s) = 4(3 + s) Reorder the terms: -1 + 7s + -3s = 4(3 + s) Combine like terms: 7s + -3s = 4s -1 + 4s = 4(3 + s) -1 + 4s = (3 * 4 + s * 4) -1 + 4s = (12 + 4s) Add '-4s' to each side of the equation. -1 + 4s + -4s = 12 + 4s + -4s Combine like terms: 4s + -4s = 0 -1 + 0 = 12 + 4s + -4s -1 = 12 + 4s + -4s Combine like terms: 4s + -4s = 0 -1 = 12 + 0 -1 = 12 Solving -1 = 12 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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