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Simplifying -21 = 3 + -7x + -5x Combine like terms: -7x + -5x = -12x -21 = 3 + -12x Solving -21 = 3 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. -21 + 12x = 3 + -12x + 12x Combine like terms: -12x + 12x = 0 -21 + 12x = 3 + 0 -21 + 12x = 3 Add '21' to each side of the equation. -21 + 21 + 12x = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = 3 + 21 12x = 3 + 21 Combine like terms: 3 + 21 = 24 12x = 24 Divide each side by '12'. x = 2 Simplifying x = 2
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