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Simplifying 7x + 3 = 21x Reorder the terms: 3 + 7x = 21x Solving 3 + 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. 3 + 7x + -21x = 21x + -21x Combine like terms: 7x + -21x = -14x 3 + -14x = 21x + -21x Combine like terms: 21x + -21x = 0 3 + -14x = 0 Add '-3' to each side of the equation. 3 + -3 + -14x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -14x = 0 + -3 -14x = 0 + -3 Combine like terms: 0 + -3 = -3 -14x = -3 Divide each side by '-14'. x = 0.2142857143 Simplifying x = 0.2142857143
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