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6y + 21 = 39
6y = 39-21
6y = 18
y = 18 : 6
y = 3
gunakan sifat distributif menjadi
(2y x 3) + (7 x 3) = 39
6y + 21 = 39
6y +21 -21 = 39 -21 (kurangkan kedua ruas dengan 21)
6y = 18
y= 18/6
y= 3