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Simplifying 7x + -4 = 21x Reorder the terms: -4 + 7x = 21x Solving -4 + 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. -4 + 7x + -21x = 21x + -21x Combine like terms: 7x + -21x = -14x -4 + -14x = 21x + -21x Combine like terms: 21x + -21x = 0 -4 + -14x = 0 Add '4' to each side of the equation. -4 + 4 + -14x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -14x = 0 + 4 -14x = 0 + 4 Combine like terms: 0 + 4 = 4 -14x = 4 Divide each side by '-14'. x = -0.2857142857 Simplifying x = -0.2857142857
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