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