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Simplifying 9 + 15 + -3 + x = 3x + 4x + -21 Combine like terms: 9 + 15 = 24 24 + -3 + x = 3x + 4x + -21 Combine like terms: 24 + -3 = 21 21 + x = 3x + 4x + -21 Reorder the terms: 21 + x = -21 + 3x + 4x Combine like terms: 3x + 4x = 7x 21 + x = -21 + 7x Solving 21 + x = -21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 21 + x + -7x = -21 + 7x + -7x Combine like terms: x + -7x = -6x 21 + -6x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -6x = -21 + 0 21 + -6x = -21 Add '-21' to each side of the equation. 21 + -21 + -6x = -21 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = -21 + -21 -6x = -21 + -21 Combine like terms: -21 + -21 = -42 -6x = -42 Divide each side by '-6'. x = 7 Simplifying x = 7
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