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Simplifying x + -9 = -21 + 7x Reorder the terms: -9 + x = -21 + 7x Solving -9 + x = -21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -9 + x + -7x = -21 + 7x + -7x Combine like terms: x + -7x = -6x -9 + -6x = -21 + 7x + -7x Combine like terms: 7x + -7x = 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 = -12 -6x = -12 Divide each side by '-6'. x = 2 Simplifying x = 2
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