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Simplifying 2x + (3x + -12) = 4x + 9 Reorder the terms: 2x + (-12 + 3x) = 4x + 9 Remove parenthesis around (-12 + 3x) 2x + -12 + 3x = 4x + 9 Reorder the terms: -12 + 2x + 3x = 4x + 9 Combine like terms: 2x + 3x = 5x -12 + 5x = 4x + 9 Reorder the terms: -12 + 5x = 9 + 4x Solving -12 + 5x = 9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -12 + 5x + -4x = 9 + 4x + -4x Combine like terms: 5x + -4x = 1x -12 + 1x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 -12 + 1x = 9 + 0 -12 + 1x = 9 Add '12' to each side of the equation. -12 + 12 + 1x = 9 + 12 Combine like terms: -12 + 12 = 0 0 + 1x = 9 + 12 1x = 9 + 12 Combine like terms: 9 + 12 = 21 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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