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Simplifying 12x + -5(x + -4) = 7x + 5 Reorder the terms: 12x + -5(-4 + x) = 7x + 5 12x + (-4 * -5 + x * -5) = 7x + 5 12x + (20 + -5x) = 7x + 5 Reorder the terms: 20 + 12x + -5x = 7x + 5 Combine like terms: 12x + -5x = 7x 20 + 7x = 7x + 5 Reorder the terms: 20 + 7x = 5 + 7x Add '-7x' to each side of the equation. 20 + 7x + -7x = 5 + 7x + -7x Combine like terms: 7x + -7x = 0 20 + 0 = 5 + 7x + -7x 20 = 5 + 7x + -7x Combine like terms: 7x + -7x = 0 20 = 5 + 0 20 = 5 Solving 20 = 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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