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Simplifying 4x + 9 + 3(x + -2) = 7x + 12 Reorder the terms: 4x + 9 + 3(-2 + x) = 7x + 12 4x + 9 + (-2 * 3 + x * 3) = 7x + 12 4x + 9 + (-6 + 3x) = 7x + 12 Reorder the terms: 9 + -6 + 4x + 3x = 7x + 12 Combine like terms: 9 + -6 = 3 3 + 4x + 3x = 7x + 12 Combine like terms: 4x + 3x = 7x 3 + 7x = 7x + 12 Reorder the terms: 3 + 7x = 12 + 7x Add '-7x' to each side of the equation. 3 + 7x + -7x = 12 + 7x + -7x Combine like terms: 7x + -7x = 0 3 + 0 = 12 + 7x + -7x 3 = 12 + 7x + -7x Combine like terms: 7x + -7x = 0 3 = 12 + 0 3 = 12 Solving 3 = 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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