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Simplifying 6x + 3(x + -3) = 81 Reorder the terms: 6x + 3(-3 + x) = 81 6x + (-3 * 3 + x * 3) = 81 6x + (-9 + 3x) = 81 Reorder the terms: -9 + 6x + 3x = 81 Combine like terms: 6x + 3x = 9x -9 + 9x = 81 Solving -9 + 9x = 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 + 9x = 81 + 9 Combine like terms: -9 + 9 = 0 0 + 9x = 81 + 9 9x = 81 + 9 Combine like terms: 81 + 9 = 90 9x = 90 Divide each side by '9'. x = 10 Simplifying x = 10
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