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Simplifying 81 = 7y + 4 Reorder the terms: 81 = 4 + 7y Solving 81 = 4 + 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. 81 + -7y = 4 + 7y + -7y Combine like terms: 7y + -7y = 0 81 + -7y = 4 + 0 81 + -7y = 4 Add '-81' to each side of the equation. 81 + -81 + -7y = 4 + -81 Combine like terms: 81 + -81 = 0 0 + -7y = 4 + -81 -7y = 4 + -81 Combine like terms: 4 + -81 = -77 -7y = -77 Divide each side by '-7'. y = 11 Simplifying y = 11
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