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Simplifying 0.4x + -0.5(3) = 2.1 Multiply -0.5 * 3 0.4x + -1.5 = 2.1 Reorder the terms: -1.5 + 0.4x = 2.1 Solving -1.5 + 0.4x = 2.1 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 + 0.4x = 2.1 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + 0.4x = 2.1 + 1.5 0.4x = 2.1 + 1.5 Combine like terms: 2.1 + 1.5 = 3.6 0.4x = 3.6 Divide each side by '0.4'. x = 9 Simplifying x = 9
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