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Simplifying -3x + 9 = -40 + 4x Reorder the terms: 9 + -3x = -40 + 4x Solving 9 + -3x = -40 + 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 = -40 + 4x + -4x Combine like terms: -3x + -4x = -7x 9 + -7x = -40 + 4x + -4x Combine like terms: 4x + -4x = 0 9 + -7x = -40 + 0 9 + -7x = -40 Add '-9' to each side of the equation. 9 + -9 + -7x = -40 + -9 Combine like terms: 9 + -9 = 0 0 + -7x = -40 + -9 -7x = -40 + -9 Combine like terms: -40 + -9 = -49 -7x = -49 Divide each side by '-7'. x = 7 Simplifying x = 7

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