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Simplifying 3.9 = 1.3 + -0.4y Solving 3.9 = 1.3 + -0.4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4y' to each side of the equation. 3.9 + 0.4y = 1.3 + -0.4y + 0.4y Combine like terms: -0.4y + 0.4y = 0.0 3.9 + 0.4y = 1.3 + 0.0 3.9 + 0.4y = 1.3 Add '-3.9' to each side of the equation. 3.9 + -3.9 + 0.4y = 1.3 + -3.9 Combine like terms: 3.9 + -3.9 = 0.0 0.0 + 0.4y = 1.3 + -3.9 0.4y = 1.3 + -3.9 Combine like terms: 1.3 + -3.9 = -2.6 0.4y = -2.6 Divide each side by '0.4'. y = -6.5 Simplifying y = -6.5
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