solusi dari persamaan 2(x-7)+5(3+2x)+5=0,maka 4x A.-2 B.- 1/2 C.0 D.2 E.4

Materi : Program Linear
Bahasan : Persamaan Linear 1 Variabel
Jawaban : A. - 2

Langkah - langkah :
2(x - 7) + 5(3 + 2x) + 5 = 0
2x - 14 + 15 + 10x = - 5
2x + 10x = - 5 - 1
12x = - 6
x = - 6/12
x = - 1/2
Substitusi x ke 4x :
4(-1/2)
- 2

2 ( x - 7 ) + 5 ( 3 + 2x ) + 5 = 0
2x - 14 + 15 + 10x + 5 = 0
2x + 10x = 0 + 14 - 15 - 5
12x = -6
x = -6/12
x = -1/2

Maka,
4x
= 4 ( -1/2 )
= -2 ( A )