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Simplifying 3.5 = -7y + 21 Reorder the terms: 3.5 = 21 + -7y Solving 3.5 = 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. 3.5 + 7y = 21 + -7y + 7y Combine like terms: -7y + 7y = 0 3.5 + 7y = 21 + 0 3.5 + 7y = 21 Add '-3.5' to each side of the equation. 3.5 + -3.5 + 7y = 21 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + 7y = 21 + -3.5 7y = 21 + -3.5 Combine like terms: 21 + -3.5 = 17.5 7y = 17.5 Divide each side by '7'. y = 2.5 Simplifying y = 2.5
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