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