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Simplifying 7 * 9 = (7 * 10) + -1(7y) Multiply 7 * 9 63 = (7 * 10) + -1(7y) Multiply 7 * 10 63 = (70) + -1(7y) 63 = 70 + -1(7y) Remove parenthesis around (7y) 63 = 70 + -1 * 7y Multiply -1 * 7 63 = 70 + -7y Solving 63 = 70 + -7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7y' to each side of the equation. 63 + 7y = 70 + -7y + 7y Combine like terms: -7y + 7y = 0 63 + 7y = 70 + 0 63 + 7y = 70 Add '-63' to each side of the equation. 63 + -63 + 7y = 70 + -63 Combine like terms: 63 + -63 = 0 0 + 7y = 70 + -63 7y = 70 + -63 Combine like terms: 70 + -63 = 7 7y = 7 Divide each side by '7'. y = 1 Simplifying y = 1
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