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Simplifying 6 * 7 = (y + 9) * 9 Multiply 6 * 7 42 = (y + 9) * 9 Reorder the terms: 42 = (9 + y) * 9 Reorder the terms for easier multiplication: 42 = 9(9 + y) 42 = (9 * 9 + y * 9) 42 = (81 + 9y) Solving 42 = 81 + 9y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9y' to each side of the equation. 42 + -9y = 81 + 9y + -9y Combine like terms: 9y + -9y = 0 42 + -9y = 81 + 0 42 + -9y = 81 Add '-42' to each side of the equation. 42 + -42 + -9y = 81 + -42 Combine like terms: 42 + -42 = 0 0 + -9y = 81 + -42 -9y = 81 + -42 Combine like terms: 81 + -42 = 39 -9y = 39 Divide each side by '-9'. y = -4.333333333 Simplifying y = -4.333333333
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