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Simplifying 21 = 0.3(3 + -4x) 21 = (3 * 0.3 + -4x * 0.3) 21 = (0.9 + -1.2x) Solving 21 = 0.9 + -1.2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2x' to each side of the equation. 21 + 1.2x = 0.9 + -1.2x + 1.2x Combine like terms: -1.2x + 1.2x = 0.0 21 + 1.2x = 0.9 + 0.0 21 + 1.2x = 0.9 Add '-21' to each side of the equation. 21 + -21 + 1.2x = 0.9 + -21 Combine like terms: 21 + -21 = 0 0 + 1.2x = 0.9 + -21 1.2x = 0.9 + -21 Combine like terms: 0.9 + -21 = -20.1 1.2x = -20.1 Divide each side by '1.2'. x = -16.75 Simplifying x = -16.75
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