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3x=2+19
3x=21
x=21/3
x=7
20) sisi= (x+7),(2x-1) dan (3x-5)
keliling = 31
keliling = jumlah semua sisi
31=(x+7)+(2x-1)+(3x-5)
31=x+7+2x-1+3x-5
31=6x+1
31-1=6x
30=6x
30/6=6x
5=x
(X+7)=5+7
=12
(2x-1)=2x5-1
=9
(3x-5)=3x5-5
=10
sisi terpanjang = 12