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(x+2)(x-3)=0
1/-2+1/3= ??
a = 1, b = -2, c = 5
1/x1 + 1/ x2 = bentuk jadinya -b/a dibagi c/a
-(-2)/1 dibagi 5/1 = 2/ 5 = 0,4
semoga bermanfaat guys, kalo.kurang jelas tinggal tanya