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Simplifying 21x + 9 = 7x + 3 Reorder the terms: 9 + 21x = 7x + 3 Reorder the terms: 9 + 21x = 3 + 7x Solving 9 + 21x = 3 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 9 + 21x + -7x = 3 + 7x + -7x Combine like terms: 21x + -7x = 14x 9 + 14x = 3 + 7x + -7x Combine like terms: 7x + -7x = 0 9 + 14x = 3 + 0 9 + 14x = 3 Add '-9' to each side of the equation. 9 + -9 + 14x = 3 + -9 Combine like terms: 9 + -9 = 0 0 + 14x = 3 + -9 14x = 3 + -9 Combine like terms: 3 + -9 = -6 14x = -6 Divide each side by '14'. x = -0.4285714286 Simplifying x = -0.4285714286
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