9. penyelesaian dari x + 5 + 3x - 7 adalah... a. x = 9 b. x = -9 c. x = 6 d. x = -6 JAWABNYA PKE CARA... JGN NGASAL....!!!!!!!!!!!!

Question

Matematika Diposting : 2017-04-09 Diupdate : 2023-11-25 adhiyakhairunnisa

Pertanyaan

9. penyelesaian dari x + 5 + 3x - 7 adalah...
a. x = 9
b. x = -9
c. x = 6
d. x = -6

JAWABNYA PKE CARA... JGN NGASAL....!!!!!!!!!!!!

Answer 1

x + 5 = 3x - 7
x - 3x = - 7 - 5
- 2x = - 12
x = - 12/ - 2
x = 6 ( C )

Answer 2

Jawab :

x + 5 = 3x - 7
⇔ x + 5 + 7 = 3x - 7 + 7
⇔ x + 12 = 3x
⇔ x + 12 - x = 3x - x
⇔ 12 = 2x
⇔ x = 12 ÷ 2
⇔ x = 6 [C]

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