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Simplifying 0.80x + 0.05(18 + -1x) = 0.10(-81) 0.80x + (18 * 0.05 + -1x * 0.05) = 0.10(-81) 0.80x + (0.9 + -0.05x) = 0.10(-81) Reorder the terms: 0.9 + 0.80x + -0.05x = 0.10(-81) Combine like terms: 0.80x + -0.05x = 0.75x 0.9 + 0.75x = 0.10(-81) Multiply 0.10 * -81 0.9 + 0.75x = -8.1 Solving 0.9 + 0.75x = -8.1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + 0.75x = -8.1 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + 0.75x = -8.1 + -0.9 0.75x = -8.1 + -0.9 Combine like terms: -8.1 + -0.9 = -9 0.75x = -9 Divide each side by '0.75'. x = -12 Simplifying x = -12
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