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-16 = (-8*x)/5-(4*y) // - (-8*x)/5-(4*y)
4*y-((-8*x)/5)-16 = 0
(8/5)*x+4*y-16 = 0
8/5*x+4*y-16 = 0 // - 4*y-16
8/5*x = -(4*y-16) // : 8/5
x = (-(4*y-16))/8/5
x = 5/8*(16-(4*y))
x = 5/8*(16-(4*y))
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