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Simplifying 2 * 3x + 1 + -5 * 9x + -2 = 81 Multiply 2 * 3 6x + 1 + -5 * 9x + -2 = 81 Multiply -5 * 9 6x + 1 + -45x + -2 = 81 Reorder the terms: 1 + -2 + 6x + -45x = 81 Combine like terms: 1 + -2 = -1 -1 + 6x + -45x = 81 Combine like terms: 6x + -45x = -39x -1 + -39x = 81 Solving -1 + -39x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -39x = 81 + 1 Combine like terms: -1 + 1 = 0 0 + -39x = 81 + 1 -39x = 81 + 1 Combine like terms: 81 + 1 = 82 -39x = 82 Divide each side by '-39'. x = -2.102564103 Simplifying x = -2.102564103
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