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Simplifying 3x + 3(4 + -6x) + 9 = 21 3x + (4 * 3 + -6x * 3) + 9 = 21 3x + (12 + -18x) + 9 = 21 Reorder the terms: 12 + 9 + 3x + -18x = 21 Combine like terms: 12 + 9 = 21 21 + 3x + -18x = 21 Combine like terms: 3x + -18x = -15x 21 + -15x = 21 Add '-21' to each side of the equation. 21 + -21 + -15x = 21 + -21 Combine like terms: 21 + -21 = 0 0 + -15x = 21 + -21 -15x = 21 + -21 Combine like terms: 21 + -21 = 0 -15x = 0 Solving -15x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-15'. x = 0 Simplifying x = 0
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