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Simplifying -4y + 21 = -7y + 15 Reorder the terms: 21 + -4y = -7y + 15 Reorder the terms: 21 + -4y = 15 + -7y Solving 21 + -4y = 15 + -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. 21 + -4y + 7y = 15 + -7y + 7y Combine like terms: -4y + 7y = 3y 21 + 3y = 15 + -7y + 7y Combine like terms: -7y + 7y = 0 21 + 3y = 15 + 0 21 + 3y = 15 Add '-21' to each side of the equation. 21 + -21 + 3y = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 3y = 15 + -21 3y = 15 + -21 Combine like terms: 15 + -21 = -6 3y = -6 Divide each side by '3'. y = -2 Simplifying y = -2
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