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7x - 3x = 9 + 15
4x = 24
x = 6
2x - 1 = 2(6) - 1
= 12 - 1
= 11
Jadi jawabannya adalah yang A. 11.
7x - 15 + 15 = 3x + 9 + 15
7x = 3x + 24
7x - 3x = 3x - 3x + 24
4x = 24
1/4 × 4x = 1/4 × 24
x = 6
maka nilai 2x - 1
(2 × 6) - 1 = 12 - 1 = 11 (a)