no.6 dan 7 dengan jalannya. jgn asal asalan

7.)
|2x-3| = |-x|
|2x-3| = x
2x-3 = x
-(2x-3) = x

-3 = x - 2x
-3 = -x
x = 3

-2x + 3 = x
3 = 2x + x
3 = 3x
x = 1

HP = {3,1}

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