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Simplifying 0.3(5 + -4x) = 21 (5 * 0.3 + -4x * 0.3) = 21 (1.5 + -1.2x) = 21 Solving 1.5 + -1.2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + -1.2x = 21 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + -1.2x = 21 + -1.5 -1.2x = 21 + -1.5 Combine like terms: 21 + -1.5 = 19.5 -1.2x = 19.5 Divide each side by '-1.2'. x = -16.25 Simplifying x = -16.25
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