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Simplifying 4 = 7y + 21 Reorder the terms: 4 = 21 + 7y Solving 4 = 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. 4 + -7y = 21 + 7y + -7y Combine like terms: 7y + -7y = 0 4 + -7y = 21 + 0 4 + -7y = 21 Add '-4' to each side of the equation. 4 + -4 + -7y = 21 + -4 Combine like terms: 4 + -4 = 0 0 + -7y = 21 + -4 -7y = 21 + -4 Combine like terms: 21 + -4 = 17 -7y = 17 Divide each side by '-7'. y = -2.428571429 Simplifying y = -2.428571429
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