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Simplifying -3 + 9x = -21 Solving -3 + 9x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 9x = -21 + 3 Combine like terms: -3 + 3 = 0 0 + 9x = -21 + 3 9x = -21 + 3 Combine like terms: -21 + 3 = -18 9x = -18 Divide each side by '9'. x = -2 Simplifying x = -2
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