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2014-05-26T15:41:48+03:00
A+b=195 =>a=195-b

a+75=b+40
195-b+75=b+40
195+75-40=b+b
230=2b
b=115

a=195-115
a=80
2014-05-26T15:42:20+03:00
X+y = 195
x + 75 = y +40

Din prima y = 195 - x
x +75 = 195 -x +40
x +x = 195 +40 -75
2x = 160
x = 160/2
x = 80

x+y = 195
80+y = 195
y = 195 -80
y = 115