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Simplifying 0.8(1 + 0.5x) = -4 (1 * 0.8 + 0.5x * 0.8) = -4 (0.8 + 0.4x) = -4 Solving 0.8 + 0.4x = -4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + 0.4x = -4 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + 0.4x = -4 + -0.8 0.4x = -4 + -0.8 Combine like terms: -4 + -0.8 = -4.8 0.4x = -4.8 Divide each side by '0.4'. x = -12 Simplifying x = -12
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