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Simplifying 21 + -4x = 3(6 + 3x) + 3 21 + -4x = (6 * 3 + 3x * 3) + 3 21 + -4x = (18 + 9x) + 3 Reorder the terms: 21 + -4x = 18 + 3 + 9x Combine like terms: 18 + 3 = 21 21 + -4x = 21 + 9x Add '-21' to each side of the equation. 21 + -21 + -4x = 21 + -21 + 9x Combine like terms: 21 + -21 = 0 0 + -4x = 21 + -21 + 9x -4x = 21 + -21 + 9x Combine like terms: 21 + -21 = 0 -4x = 0 + 9x -4x = 9x Solving -4x = 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -4x + -9x = 9x + -9x Combine like terms: -4x + -9x = -13x -13x = 9x + -9x Combine like terms: 9x + -9x = 0 -13x = 0 Divide each side by '-13'. x = 0 Simplifying x = 0
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