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Simplifying 3x + 3(-2x + 21) = 81 Reorder the terms: 3x + 3(21 + -2x) = 81 3x + (21 * 3 + -2x * 3) = 81 3x + (63 + -6x) = 81 Reorder the terms: 63 + 3x + -6x = 81 Combine like terms: 3x + -6x = -3x 63 + -3x = 81 Solving 63 + -3x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -3x = 81 + -63 Combine like terms: 63 + -63 = 0 0 + -3x = 81 + -63 -3x = 81 + -63 Combine like terms: 81 + -63 = 18 -3x = 18 Divide each side by '-3'. x = -6 Simplifying x = -6
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