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Simplifying 9 + -9(x + 5) + -7 = 9 + 3(9 + -3x) + -81 Reorder the terms: 9 + -9(5 + x) + -7 = 9 + 3(9 + -3x) + -81 9 + (5 * -9 + x * -9) + -7 = 9 + 3(9 + -3x) + -81 9 + (-45 + -9x) + -7 = 9 + 3(9 + -3x) + -81 Reorder the terms: 9 + -45 + -7 + -9x = 9 + 3(9 + -3x) + -81 Combine like terms: 9 + -45 = -36 -36 + -7 + -9x = 9 + 3(9 + -3x) + -81 Combine like terms: -36 + -7 = -43 -43 + -9x = 9 + 3(9 + -3x) + -81 -43 + -9x = 9 + (9 * 3 + -3x * 3) + -81 -43 + -9x = 9 + (27 + -9x) + -81 Reorder the terms: -43 + -9x = 9 + 27 + -81 + -9x Combine like terms: 9 + 27 = 36 -43 + -9x = 36 + -81 + -9x Combine like terms: 36 + -81 = -45 -43 + -9x = -45 + -9x Add '9x' to each side of the equation. -43 + -9x + 9x = -45 + -9x + 9x Combine like terms: -9x + 9x = 0 -43 + 0 = -45 + -9x + 9x -43 = -45 + -9x + 9x Combine like terms: -9x + 9x = 0 -43 = -45 + 0 -43 = -45 Solving -43 = -45 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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