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Simplifying x + (3x + -15) = 340 Reorder the terms: x + (-15 + 3x) = 340 Remove parenthesis around (-15 + 3x) x + -15 + 3x = 340 Reorder the terms: -15 + x + 3x = 340 Combine like terms: x + 3x = 4x -15 + 4x = 340 Solving -15 + 4x = 340 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 4x = 340 + 15 Combine like terms: -15 + 15 = 0 0 + 4x = 340 + 15 4x = 340 + 15 Combine like terms: 340 + 15 = 355 4x = 355 Divide each side by '4'. x = 88.75 Simplifying x = 88.75
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