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karena, rumus keliling kan jumlah semua sisi..
tapi kan hrsnya ada 3 sisi.. knp cmn ada 2 sisi di soal??
kl cmn duketahiu gt aja, brrti kamu bknnya
(2x-1) + (3x-1) + (x+3) = 19
2x-1+3x-1+x+3 = 19
6x + 1 = 19
6x = 19-1
6x = 18
x = 18:6
x=3