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Simplifying -8y + -9 = 7y + 21 Reorder the terms: -9 + -8y = 7y + 21 Reorder the terms: -9 + -8y = 21 + 7y Solving -9 + -8y = 21 + 7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7y' to each side of the equation. -9 + -8y + -7y = 21 + 7y + -7y Combine like terms: -8y + -7y = -15y -9 + -15y = 21 + 7y + -7y Combine like terms: 7y + -7y = 0 -9 + -15y = 21 + 0 -9 + -15y = 21 Add '9' to each side of the equation. -9 + 9 + -15y = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -15y = 21 + 9 -15y = 21 + 9 Combine like terms: 21 + 9 = 30 -15y = 30 Divide each side by '-15'. y = -2 Simplifying y = -2
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