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(2/5)*x-(5*x)+(3/4)*y+6*y+2.7 = 0
(2/5)*x-5*x+(3/4)*y+6*y+2.7 = 0
27/4*y-23/5*x+2.7 = 0 // - 27/4*y+2.7
-23/5*x = -(27/4*y+2.7) // : -23/5
x = (-(27/4*y+2.7))/(-23/5)
x = 5/23*(27/4*y+2.7)
x = 5/23*(27/4*y+2.7)
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