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Simplifying -57 + 9x = 87 + -3x Solving -57 + 9x = 87 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -57 + 9x + 3x = 87 + -3x + 3x Combine like terms: 9x + 3x = 12x -57 + 12x = 87 + -3x + 3x Combine like terms: -3x + 3x = 0 -57 + 12x = 87 + 0 -57 + 12x = 87 Add '57' to each side of the equation. -57 + 57 + 12x = 87 + 57 Combine like terms: -57 + 57 = 0 0 + 12x = 87 + 57 12x = 87 + 57 Combine like terms: 87 + 57 = 144 12x = 144 Divide each side by '12'. x = 12 Simplifying x = 12
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