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Simplifying x + 2x + (x + -3) = 45 Reorder the terms: x + 2x + (-3 + x) = 45 Remove parenthesis around (-3 + x) x + 2x + -3 + x = 45 Reorder the terms: -3 + x + 2x + x = 45 Combine like terms: x + 2x = 3x -3 + 3x + x = 45 Combine like terms: 3x + x = 4x -3 + 4x = 45 Solving -3 + 4x = 45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 4x = 45 + 3 Combine like terms: -3 + 3 = 0 0 + 4x = 45 + 3 4x = 45 + 3 Combine like terms: 45 + 3 = 48 4x = 48 Divide each side by '4'. x = 12 Simplifying x = 12
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