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4x-5y=18
4x-4y+5x+5y=16
4x-5y=18
9x+y=16
4x-5y=18
y=16-9x
4x-5(16-9x)=18
y=16-9x
4x-80+45x=18
y=16-9x
49x=98
y=16-9*2
x=2
y=16-18
x=2
y=-2
x=2