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0 = -
= ....kedua ruas kalikan dengan 10
=
2x = x + 1
2x - x = 1
x = 1
2) - = 810
3² . - = 810
9. - 3² . = 810 ....bagi dengan - 9
- + = - 90
- + 90 = 0
- + 90 = 0
misa : = A
A² - A + 90 = 0 tidak ada solusi karena D < 0