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Simplifying 6x + -3(x + 2) = 21 Reorder the terms: 6x + -3(2 + x) = 21 6x + (2 * -3 + x * -3) = 21 6x + (-6 + -3x) = 21 Reorder the terms: -6 + 6x + -3x = 21 Combine like terms: 6x + -3x = 3x -6 + 3x = 21 Solving -6 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3x = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 3x = 21 + 6 3x = 21 + 6 Combine like terms: 21 + 6 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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