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Simplifying 3x + -9 = 4(x + 3) Reorder the terms: -9 + 3x = 4(x + 3) Reorder the terms: -9 + 3x = 4(3 + x) -9 + 3x = (3 * 4 + x * 4) -9 + 3x = (12 + 4x) Solving -9 + 3x = 12 + 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. -9 + 3x + -4x = 12 + 4x + -4x Combine like terms: 3x + -4x = -1x -9 + -1x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -9 + -1x = 12 + 0 -9 + -1x = 12 Add '9' to each side of the equation. -9 + 9 + -1x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 12 + 9 -1x = 12 + 9 Combine like terms: 12 + 9 = 21 -1x = 21 Divide each side by '-1'. x = -21 Simplifying x = -21
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