Diketahui 5(x + 3) – 25 = 3(4x – 1). Nilai dari x – 1 adalah .... 3 poin A. –2 B. –1 C. 0 D. 2
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- Nilai x
→ 5(x + 3) - 25 = 3(4x - 1)
→ 5x + 15 - 25 = 12x - 3
→ 5x - 12x = -3 + 25 - 15
→ -7x = 7
→ x = -1
- Nilai x - 1
→ x - 1
→ -1 - 1
→ -2 (A.)
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Jawaban:
A. -2
Penjelasan dengan langkah-langkah:
5(x+3) - 25 = 3(4x-1)
5x + 15 -25 = 12x - 3
5x - 10 = 12x - 3
12x - 5x= -10 + 3
7x = -7
x = -7/7
x= -1
Nilai X-1 = -1 - 1 = -2
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