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b*((7*(2*x-(5*a)))/3) = 21*(4*a-2) // - 21*(4*a-2)
b*((7*(2*x-(5*a)))/3)-(21*(4*a-2)) = 0
b*((7*(2*x-5*a))/3)-21*(4*a-2) = 0
(7*b*(2*x-5*a))/3-21*(4*a-2) = 0
(7*b*(2*x-5*a))/3+(-21*3*(4*a-2))/3 = 0
7*b*(2*x-5*a)-21*3*(4*a-2) = 0
14*b*x-252*a-35*a*b+126 = 0
(14*b*x-252*a-35*a*b+126)/3 = 0
(14*b*x-252*a-35*a*b+126)/3 = 0 // * 3
14*b*x-252*a-35*a*b+126 = 0
14*b*x-252*a-35*a*b+126 = 0 // - 126-252*a-35*a*b
14*b*x = -(126-252*a-35*a*b) // : 14*b
x = (-(126-252*a-35*a*b))/(14*b)
x = (-1/14)*b^-1*(126-252*a-35*a*b)
x = (-1/14)*b^-1*(126-252*a-35*a*b)
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