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|A| = - 10x
|B| = 3.5 - 2x.x
|B| = 15 -
|A| = |B|
- 10x = 15 -
+ - 10x - 15 = 0
- 10x - 15 = 0 .......... bagi dengan 5
- 2x - 3 = 0
(x - 3) (x + 1) = 0
maka x = 3 atau x = -1