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Simplifying 0.81(1 + 0.5x) = -4 (1 * 0.81 + 0.5x * 0.81) = -4 (0.81 + 0.405x) = -4 Solving 0.81 + 0.405x = -4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.81' to each side of the equation. 0.81 + -0.81 + 0.405x = -4 + -0.81 Combine like terms: 0.81 + -0.81 = 0.00 0.00 + 0.405x = -4 + -0.81 0.405x = -4 + -0.81 Combine like terms: -4 + -0.81 = -4.81 0.405x = -4.81 Divide each side by '0.405'. x = -11.87654321 Simplifying x = -11.87654321
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