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Simplifying (5y + 7) + -1(5 + -4y) = 9 Reorder the terms: (7 + 5y) + -1(5 + -4y) = 9 Remove parenthesis around (7 + 5y) 7 + 5y + -1(5 + -4y) = 9 7 + 5y + (5 * -1 + -4y * -1) = 9 7 + 5y + (-5 + 4y) = 9 Reorder the terms: 7 + -5 + 5y + 4y = 9 Combine like terms: 7 + -5 = 2 2 + 5y + 4y = 9 Combine like terms: 5y + 4y = 9y 2 + 9y = 9 Solving 2 + 9y = 9 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 9y = 9 + -2 Combine like terms: 2 + -2 = 0 0 + 9y = 9 + -2 9y = 9 + -2 Combine like terms: 9 + -2 = 7 9y = 7 Divide each side by '9'. y = 0.7777777778 Simplifying y = 0.7777777778
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