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x-2y=-3
y=5-3x
x-2(5-3x)=-3
y=5-3x
x-10=6x=-3
y=5-3x
7x=-3+10
y=5-3x
7x=7
y=5-3x
x=1
y=5-3*1
x=1
y=2
x=1
spr. 3*1+2=5
1-2*2=-3