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Simplifying 6x + 21 = 18 + 4x Reorder the terms: 21 + 6x = 18 + 4x Solving 21 + 6x = 18 + 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. 21 + 6x + -4x = 18 + 4x + -4x Combine like terms: 6x + -4x = 2x 21 + 2x = 18 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + 2x = 18 + 0 21 + 2x = 18 Add '-21' to each side of the equation. 21 + -21 + 2x = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 18 + -21 2x = 18 + -21 Combine like terms: 18 + -21 = -3 2x = -3 Divide each side by '2'. x = -1.5 Simplifying x = -1.5
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