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Simplifying (7y + 4) + -1(5y + -9) = 0 Reorder the terms: (4 + 7y) + -1(5y + -9) = 0 Remove parenthesis around (4 + 7y) 4 + 7y + -1(5y + -9) = 0 Reorder the terms: 4 + 7y + -1(-9 + 5y) = 0 4 + 7y + (-9 * -1 + 5y * -1) = 0 4 + 7y + (9 + -5y) = 0 Reorder the terms: 4 + 9 + 7y + -5y = 0 Combine like terms: 4 + 9 = 13 13 + 7y + -5y = 0 Combine like terms: 7y + -5y = 2y 13 + 2y = 0 Solving 13 + 2y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 2y = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 2y = 0 + -13 2y = 0 + -13 Combine like terms: 0 + -13 = -13 2y = -13 Divide each side by '2'. y = -6.5 Simplifying y = -6.5
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