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7x-3x=9+15
4x=24
x=6
Nilai 2x-1
=2(6)-1
=12-1
=11
7x - 3x = 9 +15
4x = 24
x = 24:4
x = 6
kemudian mencari 2x - 1
2x -1 = 2 (6) - 1
= 12 - 1
= 11