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Simplifying 13 + -1(-9q) = 31 Remove parenthesis around (-9q) 13 + -1 * -9q = 31 Multiply -1 * -9 13 + 9q = 31 Solving 13 + 9q = 31 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 9q = 31 + -13 Combine like terms: 13 + -13 = 0 0 + 9q = 31 + -13 9q = 31 + -13 Combine like terms: 31 + -13 = 18 9q = 18 Divide each side by '9'. q = 2 Simplifying q = 2
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