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2014-11-13T17:49:18+02:00
A = 4b
a - 1280 = b - 50
4b - 1280 = b - 50
3b = 1230
b = 1230 : 3
b = 410
a = 4 * 410
a = 1640
31 4 31
2014-11-13T17:50:58+02:00
A = 4b
a - 1280 = b - 50
a = ?
b = ?

a - 1280 = b - 50  |+50
a - 1230 = b
4b - 1230 = b
4b = 1230 + b  |-b
3b = 1230
b = 410
a = 4b
a = 410 x 4
a = 1640
12 4 12