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Simplifying 5 + 4(3x + -2) = 21 Reorder the terms: 5 + 4(-2 + 3x) = 21 5 + (-2 * 4 + 3x * 4) = 21 5 + (-8 + 12x) = 21 Combine like terms: 5 + -8 = -3 -3 + 12x = 21 Solving -3 + 12x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 12x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 12x = 21 + 3 12x = 21 + 3 Combine like terms: 21 + 3 = 24 12x = 24 Divide each side by '12'. x = 2 Simplifying x = 2
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