1 .Pengertian nilai mutlak
2.selesaikan persamaan dari -5 l x-7 l +2 = - 13 !
2.selesaikan persamaan dari -5 l x-7 l +2 = - 13 !
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2) -5|x-7 | + 2 = - 13
-5 |x -7 | = -13 - 2
-5 |x - 7| = -15
|x - 7 | = 3
x- 7 = 3 atau x - 7 = - 3
x = 10 atau x = 4