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Simplifying -9 + -4x = -21 Solving -9 + -4x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -4x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -4x = -21 + 9 -4x = -21 + 9 Combine like terms: -21 + 9 = -12 -4x = -12 Divide each side by '-4'. x = 3 Simplifying x = 3
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