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Simplifying 12x + -3(x + 5) = 21 Reorder the terms: 12x + -3(5 + x) = 21 12x + (5 * -3 + x * -3) = 21 12x + (-15 + -3x) = 21 Reorder the terms: -15 + 12x + -3x = 21 Combine like terms: 12x + -3x = 9x -15 + 9x = 21 Solving -15 + 9x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 9x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 9x = 21 + 15 9x = 21 + 15 Combine like terms: 21 + 15 = 36 9x = 36 Divide each side by '9'. x = 4 Simplifying x = 4
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