x=-1/5y+7/5
3x-5y-45=0
3(-3/5y+7/5)-5y-45=0
y=-6
3x-5*(-6)-45=0
x=5
(x.y) = (5.-6)
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x=-1/5y+7/5
3x-5y-45=0
3(-3/5y+7/5)-5y-45=0
y=-6
3x-5*(-6)-45=0
x=5
(x.y) = (5.-6)