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Simplifying 12(x + -3) = 3x + 21 Reorder the terms: 12(-3 + x) = 3x + 21 (-3 * 12 + x * 12) = 3x + 21 (-36 + 12x) = 3x + 21 Reorder the terms: -36 + 12x = 21 + 3x Solving -36 + 12x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -36 + 12x + -3x = 21 + 3x + -3x Combine like terms: 12x + -3x = 9x -36 + 9x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 -36 + 9x = 21 + 0 -36 + 9x = 21 Add '36' to each side of the equation. -36 + 36 + 9x = 21 + 36 Combine like terms: -36 + 36 = 0 0 + 9x = 21 + 36 9x = 21 + 36 Combine like terms: 21 + 36 = 57 9x = 57 Divide each side by '9'. x = 6.333333333 Simplifying x = 6.333333333
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