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Simplifying 4x + 21x + 42 = 4x + -9 Reorder the terms: 42 + 4x + 21x = 4x + -9 Combine like terms: 4x + 21x = 25x 42 + 25x = 4x + -9 Reorder the terms: 42 + 25x = -9 + 4x Solving 42 + 25x = -9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 42 + 25x + -4x = -9 + 4x + -4x Combine like terms: 25x + -4x = 21x 42 + 21x = -9 + 4x + -4x Combine like terms: 4x + -4x = 0 42 + 21x = -9 + 0 42 + 21x = -9 Add '-42' to each side of the equation. 42 + -42 + 21x = -9 + -42 Combine like terms: 42 + -42 = 0 0 + 21x = -9 + -42 21x = -9 + -42 Combine like terms: -9 + -42 = -51 21x = -51 Divide each side by '21'. x = -2.428571429 Simplifying x = -2.428571429
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