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C. Y = 11
D. Y = 3.272~ 3,26
⇒ y = 4/6 ÷ 1/3
⇒ y = 4/6 × 3/1
⇒ y = 12/6
⇒ y = 2
c) 5y - 1 = 4y + 10
⇒ 5y - 4y = 10 + 1
⇒ y = 11
d) 4(3y - 5) = y + 16
⇒ 12y - 20 = y + 16
⇒ 12y - y = 16 + 20
⇒ 11y = 36
⇒ y = 36/11
⇒ y = 3,27
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