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Simplifying 3(x + -3) = -3x + 21 Reorder the terms: 3(-3 + x) = -3x + 21 (-3 * 3 + x * 3) = -3x + 21 (-9 + 3x) = -3x + 21 Reorder the terms: -9 + 3x = 21 + -3x Solving -9 + 3x = 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. -9 + 3x + 3x = 21 + -3x + 3x Combine like terms: 3x + 3x = 6x -9 + 6x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 -9 + 6x = 21 + 0 -9 + 6x = 21 Add '9' to each side of the equation. -9 + 9 + 6x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 6x = 21 + 9 6x = 21 + 9 Combine like terms: 21 + 9 = 30 6x = 30 Divide each side by '6'. x = 5 Simplifying x = 5
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