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Simplifying 12 + 7x + -9 = 3x + 5 + -4(2 + -1x) Reorder the terms: 12 + -9 + 7x = 3x + 5 + -4(2 + -1x) Combine like terms: 12 + -9 = 3 3 + 7x = 3x + 5 + -4(2 + -1x) 3 + 7x = 3x + 5 + (2 * -4 + -1x * -4) 3 + 7x = 3x + 5 + (-8 + 4x) Reorder the terms: 3 + 7x = 5 + -8 + 3x + 4x Combine like terms: 5 + -8 = -3 3 + 7x = -3 + 3x + 4x Combine like terms: 3x + 4x = 7x 3 + 7x = -3 + 7x Add '-7x' to each side of the equation. 3 + 7x + -7x = -3 + 7x + -7x Combine like terms: 7x + -7x = 0 3 + 0 = -3 + 7x + -7x 3 = -3 + 7x + -7x Combine like terms: 7x + -7x = 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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