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Simplifying 3x + x + -13 + 4 + -1x = 12 Reorder the terms: -13 + 4 + 3x + x + -1x = 12 Combine like terms: -13 + 4 = -9 -9 + 3x + x + -1x = 12 Combine like terms: 3x + x = 4x -9 + 4x + -1x = 12 Combine like terms: 4x + -1x = 3x -9 + 3x = 12 Solving -9 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 3x = 12 + 9 3x = 12 + 9 Combine like terms: 12 + 9 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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