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Simplifying 81 = 4y + 13 Reorder the terms: 81 = 13 + 4y Solving 81 = 13 + 4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4y' to each side of the equation. 81 + -4y = 13 + 4y + -4y Combine like terms: 4y + -4y = 0 81 + -4y = 13 + 0 81 + -4y = 13 Add '-81' to each side of the equation. 81 + -81 + -4y = 13 + -81 Combine like terms: 81 + -81 = 0 0 + -4y = 13 + -81 -4y = 13 + -81 Combine like terms: 13 + -81 = -68 -4y = -68 Divide each side by '-4'. y = 17 Simplifying y = 17
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