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7x - 15 = x^2 - 3x +10
0= x^2 - 3x +10-7x + 15
x^2 - 3x +10-7x + 15=0
x^2 - 10x +25=0
menggunakan rumus abc
a=1 b=-10 c=25
-b plusminus √b^2-4.a.c / 2.a