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Simplifying -6x = 3(x + -21) Reorder the terms: -6x = 3(-21 + x) -6x = (-21 * 3 + x * 3) -6x = (-63 + 3x) Solving -6x = -63 + 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. -6x + -3x = -63 + 3x + -3x Combine like terms: -6x + -3x = -9x -9x = -63 + 3x + -3x Combine like terms: 3x + -3x = 0 -9x = -63 + 0 -9x = -63 Divide each side by '-9'. x = 7 Simplifying x = 7
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