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Simplifying 7y + -21 = -31 + 9y Reorder the terms: -21 + 7y = -31 + 9y Solving -21 + 7y = -31 + 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. -21 + 7y + -9y = -31 + 9y + -9y Combine like terms: 7y + -9y = -2y -21 + -2y = -31 + 9y + -9y Combine like terms: 9y + -9y = 0 -21 + -2y = -31 + 0 -21 + -2y = -31 Add '21' to each side of the equation. -21 + 21 + -2y = -31 + 21 Combine like terms: -21 + 21 = 0 0 + -2y = -31 + 21 -2y = -31 + 21 Combine like terms: -31 + 21 = -10 -2y = -10 Divide each side by '-2'. y = 5 Simplifying y = 5
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