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