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Simplifying 18y + -1(21(y + -1)) = 4 Reorder the terms: 18y + -1(21(-1 + y)) = 4 18y + -1((-1 * 21 + y * 21)) = 4 18y + -1((-21 + 21y)) = 4 18y + (-21 * -1 + 21y * -1) = 4 18y + (21 + -21y) = 4 Reorder the terms: 21 + 18y + -21y = 4 Combine like terms: 18y + -21y = -3y 21 + -3y = 4 Solving 21 + -3y = 4 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 = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -3y = 4 + -21 -3y = 4 + -21 Combine like terms: 4 + -21 = -17 -3y = -17 Divide each side by '-3'. y = 5.666666667 Simplifying y = 5.666666667
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