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Simplifying 5 + -7y + -4 = 21 Reorder the terms: 5 + -4 + -7y = 21 Combine like terms: 5 + -4 = 1 1 + -7y = 21 Solving 1 + -7y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -7y = 21 + -1 Combine like terms: 1 + -1 = 0 0 + -7y = 21 + -1 -7y = 21 + -1 Combine like terms: 21 + -1 = 20 -7y = 20 Divide each side by '-7'. y = -2.857142857 Simplifying y = -2.857142857
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