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2014-11-05T22:36:59+02:00
{(15+75:x)*13+500}:20=38
(15+75:x)*13+500=38*20
(15+75:x)*13+500=760
(15+75:x)*13=760-500
(15+75:x)*13=260
15+75:x=260:13
15+75:x=20
75:x=20-15
75:x=5

x=75:5
x=15
1 5 1
2014-11-05T22:40:13+02:00
(15 + 75 : x) * 13 + 500 = 38 * 20
(15 + 75 : x) * 13 = 760 - 500
15 + 75 : x = 260 : 13
15 + 75 : x =20
75 : x = 20 - 15
75 : x = 5
75 = 5 x
x = 75 : 5
x = 15