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