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((7*y)/3)*(x+y)+5*x = 0
7/3*y*(x+y)+5*x = 0
7/3*y*(x+y)+5*x = 0
5*x+7/3*x*y+7/3*y^2 = 0
5*x+7/3*x*y+7/3*y^2 = 0
5*x+7/3*y^2 = 0 // - 7/3*y^2
5*x = -(7/3*y^2) // : 5
x = (-(7/3*y^2))/5
x = -7/15*y^2
x+7/15*y^2 = 0
x+7/15*y^2 = 0
x+7/15*y^2 = 0 // - 7/15*y^2
x = -(7/15*y^2)
x = -7/15*y^2
x = -7/15*y^2
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