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x*((5*y)/8)-9*x-(3*x)-(10*y) = 0
x*((5*y)/8)-9*x-3*x-10*y = 0
5/8*x*y-10*y = 0 // + -10*y
5/8*x*y = -(-10*y) // : 5/8*y
x = (-(-10*y))/(5/8*y)
x = 16
x = 16
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