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3×(2y+7)=39
6y+21=39
6y=39-21 (21PINDAH KE DEPAN MENJADI NEGATIF)
6Y=18 ( TERUS 6 NYA PINDAHKAN LAGI KEDEPAN MEJADI BAGI)
Y=18÷6
Y=3
6y+21 = 39
6y = 18
y = 3