write two solution of 4x-5y=15
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x=1
4(1)-5y=15
5y=15-4
y=15/5
x=2
4(2)-5y=15
8-5y=15
5y=15-8
y=6/5
4(1)-5y=15
5y=15-4
y=15/5
x=2
4(2)-5y=15
8-5y=15
5y=15-8
y=6/5
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