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Simplifying x + 3x + 7 + -1x + -12 = 40 Reorder the terms: 7 + -12 + x + 3x + -1x = 40 Combine like terms: 7 + -12 = -5 -5 + x + 3x + -1x = 40 Combine like terms: x + 3x = 4x -5 + 4x + -1x = 40 Combine like terms: 4x + -1x = 3x -5 + 3x = 40 Solving -5 + 3x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 3x = 40 + 5 Combine like terms: -5 + 5 = 0 0 + 3x = 40 + 5 3x = 40 + 5 Combine like terms: 40 + 5 = 45 3x = 45 Divide each side by '3'. x = 15 Simplifying x = 15
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