Jawabanmu

2015-07-09T15:50:15+07:00
X+2+2x-1+X+3x+5x/5 = 7
x+2+2x-1+X+3x+5x = 5x7
x+2+2x-1+X+3x+5x = 35
12x+1 = 35
12x = 35-1
12x = 34
x = 2,83
Kalo salah mohon dimaafkan