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Simplifying 0 = 0.4(2 + -1x) + -1(x + 3) 0 = (2 * 0.4 + -1x * 0.4) + -1(x + 3) 0 = (0.8 + -0.4x) + -1(x + 3) Reorder the terms: 0 = 0.8 + -0.4x + -1(3 + x) 0 = 0.8 + -0.4x + (3 * -1 + x * -1) 0 = 0.8 + -0.4x + (-3 + -1x) Reorder the terms: 0 = 0.8 + -3 + -0.4x + -1x Combine like terms: 0.8 + -3 = -2.2 0 = -2.2 + -0.4x + -1x Combine like terms: -0.4x + -1x = -1.4x 0 = -2.2 + -1.4x Solving 0 = -2.2 + -1.4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4x' to each side of the equation. 0 + 1.4x = -2.2 + -1.4x + 1.4x Remove the zero: 1.4x = -2.2 + -1.4x + 1.4x Combine like terms: -1.4x + 1.4x = 0.0 1.4x = -2.2 + 0.0 1.4x = -2.2 Divide each side by '1.4'. x = -1.571428571 Simplifying x = -1.571428571
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