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Simplifying 3y + 15 = 7y + -21 Reorder the terms: 15 + 3y = 7y + -21 Reorder the terms: 15 + 3y = -21 + 7y Solving 15 + 3y = -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. 15 + 3y + -7y = -21 + 7y + -7y Combine like terms: 3y + -7y = -4y 15 + -4y = -21 + 7y + -7y Combine like terms: 7y + -7y = 0 15 + -4y = -21 + 0 15 + -4y = -21 Add '-15' to each side of the equation. 15 + -15 + -4y = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -4y = -21 + -15 -4y = -21 + -15 Combine like terms: -21 + -15 = -36 -4y = -36 Divide each side by '-4'. y = 9 Simplifying y = 9
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