Jawabanmu

2014-05-09T19:45:59+07:00
3x + 12 = 7x - 8
12 + 8 = 7x - 3x
20 = 4x
x = 20/4
x = 5
x + 2 = 5 + 2 = 7
1 5 1
2014-05-09T19:46:25+07:00
3x+12=7x-8
12+8=7x-3x
20=4x
x=5
jadi x+2 = 5+2= 7
7x - 3x bukannya 4x
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