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Simplifying 4(x + 3) + -3x = 21 Reorder the terms: 4(3 + x) + -3x = 21 (3 * 4 + x * 4) + -3x = 21 (12 + 4x) + -3x = 21 Combine like terms: 4x + -3x = 1x 12 + 1x = 21 Solving 12 + 1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 1x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 1x = 21 + -12 1x = 21 + -12 Combine like terms: 21 + -12 = 9 1x = 9 Divide each side by '1'. x = 9 Simplifying x = 9
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