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Simplifying -81 = 6y + -13y + -18 Reorder the terms: -81 = -18 + 6y + -13y Combine like terms: 6y + -13y = -7y -81 = -18 + -7y Solving -81 = -18 + -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 = -18 + -7y + 7y Combine like terms: -7y + 7y = 0 -81 + 7y = -18 + 0 -81 + 7y = -18 Add '81' to each side of the equation. -81 + 81 + 7y = -18 + 81 Combine like terms: -81 + 81 = 0 0 + 7y = -18 + 81 7y = -18 + 81 Combine like terms: -18 + 81 = 63 7y = 63 Divide each side by '7'. y = 9 Simplifying y = 9
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