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Simplifying 7y + -9(-25 + -9y) = 77 7y + (-25 * -9 + -9y * -9) = 77 7y + (225 + 81y) = 77 Reorder the terms: 225 + 7y + 81y = 77 Combine like terms: 7y + 81y = 88y 225 + 88y = 77 Solving 225 + 88y = 77 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-225' to each side of the equation. 225 + -225 + 88y = 77 + -225 Combine like terms: 225 + -225 = 0 0 + 88y = 77 + -225 88y = 77 + -225 Combine like terms: 77 + -225 = -148 88y = -148 Divide each side by '88'. y = -1.681818182 Simplifying y = -1.681818182
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