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Simplifying 15 + -4y = 42 + -7y Solving 15 + -4y = 42 + -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. 15 + -4y + 7y = 42 + -7y + 7y Combine like terms: -4y + 7y = 3y 15 + 3y = 42 + -7y + 7y Combine like terms: -7y + 7y = 0 15 + 3y = 42 + 0 15 + 3y = 42 Add '-15' to each side of the equation. 15 + -15 + 3y = 42 + -15 Combine like terms: 15 + -15 = 0 0 + 3y = 42 + -15 3y = 42 + -15 Combine like terms: 42 + -15 = 27 3y = 27 Divide each side by '3'. y = 9 Simplifying y = 9
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