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Simplifying 3x + (x + -4) = 3x Reorder the terms: 3x + (-4 + x) = 3x Remove parenthesis around (-4 + x) 3x + -4 + x = 3x Reorder the terms: -4 + 3x + x = 3x Combine like terms: 3x + x = 4x -4 + 4x = 3x Solving -4 + 4x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -4 + 4x + -3x = 3x + -3x Combine like terms: 4x + -3x = 1x -4 + 1x = 3x + -3x Combine like terms: 3x + -3x = 0 -4 + 1x = 0 Add '4' to each side of the equation. -4 + 4 + 1x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 1x = 0 + 4 1x = 0 + 4 Combine like terms: 0 + 4 = 4 1x = 4 Divide each side by '1'. x = 4 Simplifying x = 4
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