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Simplifying 4(5 + -4y) + 9y = -1 (5 * 4 + -4y * 4) + 9y = -1 (20 + -16y) + 9y = -1 Combine like terms: -16y + 9y = -7y 20 + -7y = -1 Solving 20 + -7y = -1 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -7y = -1 + -20 Combine like terms: 20 + -20 = 0 0 + -7y = -1 + -20 -7y = -1 + -20 Combine like terms: -1 + -20 = -21 -7y = -21 Divide each side by '-7'. y = 3 Simplifying y = 3
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