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Simplifying 9 + 12 = 4x + 3 Combine like terms: 9 + 12 = 21 21 = 4x + 3 Reorder the terms: 21 = 3 + 4x Solving 21 = 3 + 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 + -4x = 3 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -4x = 3 + 0 21 + -4x = 3 Add '-21' to each side of the equation. 21 + -21 + -4x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 3 + -21 -4x = 3 + -21 Combine like terms: 3 + -21 = -18 -4x = -18 Divide each side by '-4'. x = 4.5 Simplifying x = 4.5
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