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Simplifying -7y + -15 = 2y + 21 Reorder the terms: -15 + -7y = 2y + 21 Reorder the terms: -15 + -7y = 21 + 2y Solving -15 + -7y = 21 + 2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2y' to each side of the equation. -15 + -7y + -2y = 21 + 2y + -2y Combine like terms: -7y + -2y = -9y -15 + -9y = 21 + 2y + -2y Combine like terms: 2y + -2y = 0 -15 + -9y = 21 + 0 -15 + -9y = 21 Add '15' to each side of the equation. -15 + 15 + -9y = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -9y = 21 + 15 -9y = 21 + 15 Combine like terms: 21 + 15 = 36 -9y = 36 Divide each side by '-9'. y = -4 Simplifying y = -4
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