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Simplifying 4(x + 2) + -3x = 21 Reorder the terms: 4(2 + x) + -3x = 21 (2 * 4 + x * 4) + -3x = 21 (8 + 4x) + -3x = 21 Combine like terms: 4x + -3x = 1x 8 + 1x = 21 Solving 8 + 1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 1x = 21 + -8 Combine like terms: 8 + -8 = 0 0 + 1x = 21 + -8 1x = 21 + -8 Combine like terms: 21 + -8 = 13 1x = 13 Divide each side by '1'. x = 13 Simplifying x = 13
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