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Simplifying 9 + -7x = 31 + -21x Solving 9 + -7x = 31 + -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. 9 + -7x + 21x = 31 + -21x + 21x Combine like terms: -7x + 21x = 14x 9 + 14x = 31 + -21x + 21x Combine like terms: -21x + 21x = 0 9 + 14x = 31 + 0 9 + 14x = 31 Add '-9' to each side of the equation. 9 + -9 + 14x = 31 + -9 Combine like terms: 9 + -9 = 0 0 + 14x = 31 + -9 14x = 31 + -9 Combine like terms: 31 + -9 = 22 14x = 22 Divide each side by '14'. x = 1.571428571 Simplifying x = 1.571428571
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