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t = b-(((7*x)/3)*y) // - b-(((7*x)/3)*y)
t-b+((7*x)/3)*y = 0
t-b+7/3*x*y = 0 // - t-b
7/3*x*y = -(t-b) // : 7/3*y
x = (-(t-b))/(7/3*y)
x = 3/7*y^-1*(b-t)
x = 3/7*y^-1*(b-t)
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