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Simplifying -7 = 9(9x + 9) + -1(8x + -1) Reorder the terms: -7 = 9(9 + 9x) + -1(8x + -1) -7 = (9 * 9 + 9x * 9) + -1(8x + -1) -7 = (81 + 81x) + -1(8x + -1) Reorder the terms: -7 = 81 + 81x + -1(-1 + 8x) -7 = 81 + 81x + (-1 * -1 + 8x * -1) -7 = 81 + 81x + (1 + -8x) Reorder the terms: -7 = 81 + 1 + 81x + -8x Combine like terms: 81 + 1 = 82 -7 = 82 + 81x + -8x Combine like terms: 81x + -8x = 73x -7 = 82 + 73x Solving -7 = 82 + 73x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-73x' to each side of the equation. -7 + -73x = 82 + 73x + -73x Combine like terms: 73x + -73x = 0 -7 + -73x = 82 + 0 -7 + -73x = 82 Add '7' to each side of the equation. -7 + 7 + -73x = 82 + 7 Combine like terms: -7 + 7 = 0 0 + -73x = 82 + 7 -73x = 82 + 7 Combine like terms: 82 + 7 = 89 -73x = 89 Divide each side by '-73'. x = -1.219178082 Simplifying x = -1.219178082
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