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Simplifying -21 + -5x = 43 + -9x Solving -21 + -5x = 43 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -21 + -5x + 9x = 43 + -9x + 9x Combine like terms: -5x + 9x = 4x -21 + 4x = 43 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 4x = 43 + 0 -21 + 4x = 43 Add '21' to each side of the equation. -21 + 21 + 4x = 43 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = 43 + 21 4x = 43 + 21 Combine like terms: 43 + 21 = 64 4x = 64 Divide each side by '4'. x = 16 Simplifying x = 16
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