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Simplifying 7x + -1(x + 3) = 3(2x + 1) Reorder the terms: 7x + -1(3 + x) = 3(2x + 1) 7x + (3 * -1 + x * -1) = 3(2x + 1) 7x + (-3 + -1x) = 3(2x + 1) Reorder the terms: -3 + 7x + -1x = 3(2x + 1) Combine like terms: 7x + -1x = 6x -3 + 6x = 3(2x + 1) Reorder the terms: -3 + 6x = 3(1 + 2x) -3 + 6x = (1 * 3 + 2x * 3) -3 + 6x = (3 + 6x) Add '-6x' to each side of the equation. -3 + 6x + -6x = 3 + 6x + -6x Combine like terms: 6x + -6x = 0 -3 + 0 = 3 + 6x + -6x -3 = 3 + 6x + -6x Combine like terms: 6x + -6x = 0 -3 = 3 + 0 -3 = 3 Solving -3 = 3 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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