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Simplifying 31 = 4 + -1(-9y) Remove parenthesis around (-9y) 31 = 4 + -1 * -9y Multiply -1 * -9 31 = 4 + 9y Solving 31 = 4 + 9y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9y' to each side of the equation. 31 + -9y = 4 + 9y + -9y Combine like terms: 9y + -9y = 0 31 + -9y = 4 + 0 31 + -9y = 4 Add '-31' to each side of the equation. 31 + -31 + -9y = 4 + -31 Combine like terms: 31 + -31 = 0 0 + -9y = 4 + -31 -9y = 4 + -31 Combine like terms: 4 + -31 = -27 -9y = -27 Divide each side by '-9'. y = 3 Simplifying y = 3
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