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Simplifying 13 + 9x = 31 Solving 13 + 9x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 9x = 31 + -13 Combine like terms: 13 + -13 = 0 0 + 9x = 31 + -13 9x = 31 + -13 Combine like terms: 31 + -13 = 18 9x = 18 Divide each side by '9'. x = 2 Simplifying x = 2
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