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Simplifying -7y + -21 = 0 Reorder the terms: -21 + -7y = 0 Solving -21 + -7y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -7y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -7y = 0 + 21 -7y = 0 + 21 Combine like terms: 0 + 21 = 21 -7y = 21 Divide each side by '-7'. y = -3 Simplifying y = -3
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