Jawabanmu

2014-09-04T19:24:06+07:00
5(2x-1) - 7x + 7 =  10x - 5 - 7x + 7 = 10x - 7x + 7 - 5 = 3x + 2
2014-09-04T19:25:15+07:00
5.2x = 10x, 5.-1 = -5
jadinya 10x-5-7x+7 = (10x-7x)-5+7= 3x+2