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8 x 15 = (y + 5)5
120 = 5y + 25
5y = 95
y = 19
2) 7/4 = 28/(3y - 2)
7(3y - 2) = 28 x 4 ⇒⇒⇒⇒ kedua rua dibagi 7
3y - 2 = 16
3y = 16
y = 16/3
y = 5,3333...