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3x+5=17
3x=12
x=4
jadi panjang sisi segitiga:
(1) x=4 cm
(2) x+2=4+2=6cm
(3) x+3=4+3=7cm
x+x+2+x+3=17
3x+5=17
3x=17-5
x=12/3
x=4
panjang sisi 4, 6, 7