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4x-8y=10
-4x-8y=-10
4x-8y=10
-16y=0
y=0
x=2,5
spr. 2*2,5+4*0=5+0=5
4*2,5-8*0=10-0=10
x-2y=4/*3
-3x+6y=7
3x-6y=12
-3x+6y=12
0=24
równanie sprzeczne
3x-5y=4/*2
-2x+3y = 11/*3
6x-10y=8
-6x+9y=33
-y=41
y=41
x=66 2/3