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Simplifying 20x + -7 + -12x + 4 = 20x + -7 + -12x + 12 Reorder the terms: -7 + 4 + 20x + -12x = 20x + -7 + -12x + 12 Combine like terms: -7 + 4 = -3 -3 + 20x + -12x = 20x + -7 + -12x + 12 Combine like terms: 20x + -12x = 8x -3 + 8x = 20x + -7 + -12x + 12 Reorder the terms: -3 + 8x = -7 + 12 + 20x + -12x Combine like terms: -7 + 12 = 5 -3 + 8x = 5 + 20x + -12x Combine like terms: 20x + -12x = 8x -3 + 8x = 5 + 8x Add '-8x' to each side of the equation. -3 + 8x + -8x = 5 + 8x + -8x Combine like terms: 8x + -8x = 0 -3 + 0 = 5 + 8x + -8x -3 = 5 + 8x + -8x Combine like terms: 8x + -8x = 0 -3 = 5 + 0 -3 = 5 Solving -3 = 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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