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2014-05-29T22:37:41+07:00
4x + 3x + 40 = 180
7x = 140
x = 20
<R = 3x , 3.20 = 60
2 5 2
2014-05-29T22:38:37+07:00
180 = 4x + 40 + 3x 140 = 7x X = 20 R = 60
1 5 1