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Simplifying 7x + -5 = 21x Reorder the terms: -5 + 7x = 21x Solving -5 + 7x = 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. -5 + 7x + -21x = 21x + -21x Combine like terms: 7x + -21x = -14x -5 + -14x = 21x + -21x Combine like terms: 21x + -21x = 0 -5 + -14x = 0 Add '5' to each side of the equation. -5 + 5 + -14x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -14x = 0 + 5 -14x = 0 + 5 Combine like terms: 0 + 5 = 5 -14x = 5 Divide each side by '-14'. x = -0.3571428571 Simplifying x = -0.3571428571
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