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Simplifying 25x + -40 = -90 + 21x Reorder the terms: -40 + 25x = -90 + 21x Solving -40 + 25x = -90 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -40 + 25x + -21x = -90 + 21x + -21x Combine like terms: 25x + -21x = 4x -40 + 4x = -90 + 21x + -21x Combine like terms: 21x + -21x = 0 -40 + 4x = -90 + 0 -40 + 4x = -90 Add '40' to each side of the equation. -40 + 40 + 4x = -90 + 40 Combine like terms: -40 + 40 = 0 0 + 4x = -90 + 40 4x = -90 + 40 Combine like terms: -90 + 40 = -50 4x = -50 Divide each side by '4'. x = -12.5 Simplifying x = -12.5
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