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Simplifying -9x + -21 = -3x + -7 Reorder the terms: -21 + -9x = -3x + -7 Reorder the terms: -21 + -9x = -7 + -3x Solving -21 + -9x = -7 + -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. -21 + -9x + 3x = -7 + -3x + 3x Combine like terms: -9x + 3x = -6x -21 + -6x = -7 + -3x + 3x Combine like terms: -3x + 3x = 0 -21 + -6x = -7 + 0 -21 + -6x = -7 Add '21' to each side of the equation. -21 + 21 + -6x = -7 + 21 Combine like terms: -21 + 21 = 0 0 + -6x = -7 + 21 -6x = -7 + 21 Combine like terms: -7 + 21 = 14 -6x = 14 Divide each side by '-6'. x = -2.333333333 Simplifying x = -2.333333333
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