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Simplifying 18y + -21 = 15y + 4 Reorder the terms: -21 + 18y = 15y + 4 Reorder the terms: -21 + 18y = 4 + 15y Solving -21 + 18y = 4 + 15y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-15y' to each side of the equation. -21 + 18y + -15y = 4 + 15y + -15y Combine like terms: 18y + -15y = 3y -21 + 3y = 4 + 15y + -15y Combine like terms: 15y + -15y = 0 -21 + 3y = 4 + 0 -21 + 3y = 4 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 = 25 3y = 25 Divide each side by '3'. y = 8.333333333 Simplifying y = 8.333333333
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