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Simplifying 18y + -1(21(y + -1)) = 8 Reorder the terms: 18y + -1(21(-1 + y)) = 8 18y + -1((-1 * 21 + y * 21)) = 8 18y + -1((-21 + 21y)) = 8 18y + (-21 * -1 + 21y * -1) = 8 18y + (21 + -21y) = 8 Reorder the terms: 21 + 18y + -21y = 8 Combine like terms: 18y + -21y = -3y 21 + -3y = 8 Solving 21 + -3y = 8 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3y = 8 + -21 Combine like terms: 21 + -21 = 0 0 + -3y = 8 + -21 -3y = 8 + -21 Combine like terms: 8 + -21 = -13 -3y = -13 Divide each side by '-3'. y = 4.333333333 Simplifying y = 4.333333333
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