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Simplifying 4x * 2 + -12x + 9 = 81 Reorder the terms for easier multiplication: 4 * 2x + -12x + 9 = 81 Multiply 4 * 2 8x + -12x + 9 = 81 Reorder the terms: 9 + 8x + -12x = 81 Combine like terms: 8x + -12x = -4x 9 + -4x = 81 Solving 9 + -4x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -4x = 81 + -9 Combine like terms: 9 + -9 = 0 0 + -4x = 81 + -9 -4x = 81 + -9 Combine like terms: 81 + -9 = 72 -4x = 72 Divide each side by '-4'. x = -18 Simplifying x = -18
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