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4x-5y=90
y=60-7x
4x-5y=90
y=60-7x
4x-5(60-7x)=90
y=60-7x
4x-300+35x=90
y=60-7x
39x=90+300
y=60-7x
39x=390 /:39
y=60-7x
x=10
y=60-7*10
x=10
y=60-70
x=10
y=-10
x=10