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x+y-(2x-3y)/2 = 10 ⇒ x+y-x+3/2y=10
2,5y=10 /:2,5
y=4
(3x+1)/2 + (2*4-1)/7= 6 /*2
3x+1+7/7*2=12
3x=12-1-2
3x=9
x=3
Odp. x=3, y=4.