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(7x-3y)/5=(5x-y)/3-(x-y)/2 /*30
3(x-1)=5(y+1)
6(7x-3y)=10(5x-y)-15(x+y)
3x-3=5y+5
42x-18y=50x-10y-15x-15y
3x-5y=8
7x=-7y /:7
x=-y
-3y-5y=8
-8y=8 /:(-8)
y=-1
x=1
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(7x-3y)/5=(5x-y)/3-(x-y)/2 /*30
3(x-1)=5(y+1)
6(7x-3y)=10(5x-y)-15(x+y)
3x-3=5y+5
42x-18y=50x-10y-15x-15y
3x-5y=8
7x=-7y /:7
3x-5y=8
x=-y
-3y-5y=8
x=-y
-8y=8 /:(-8)
x=-y
y=-1
y=-1
x=1