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Simplifying 12 + -3(x + 5) = 21 Reorder the terms: 12 + -3(5 + x) = 21 12 + (5 * -3 + x * -3) = 21 12 + (-15 + -3x) = 21 Combine like terms: 12 + -15 = -3 -3 + -3x = 21 Solving -3 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -3x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + -3x = 21 + 3 -3x = 21 + 3 Combine like terms: 21 + 3 = 24 -3x = 24 Divide each side by '-3'. x = -8 Simplifying x = -8
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