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