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(2/5)*x+x*((15*y^1)/2)+6*y = 0
(2/5)*x+x*((15*y)/2)+6*y = 0
15/2*x*y+6*y = 0 // - 6*y
15/2*x*y = -(6*y) // : 15/2*y
x = (-(6*y))/(15/2*y)
x = -4/5
x = -4/5
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