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b in (-oo:+oo)
7*(6/5-b)+(3/5)*b = (2/5)*(b+5) // - (2/5)*(b+5)
7*(6/5-b)-((2/5)*(b+5))+(3/5)*b = 0
7*(6/5-b)+(-2/5)*(b+5)+(3/5)*b = 0
7*(6/5-b)-2/5*(b+5)+(3*b)/5 = 0
(5*7*(6/5-b))/5+(-2/5*5*(b+5))/5+(3*b)/5 = 0
5*7*(6/5-b)-2/5*5*(b+5)+3*b = 0
3*b-37*b+32 = 0
32-34*b = 0
(32-34*b)/5 = 0
(32-34*b)/5 = 0 // * 5
32-34*b = 0
32-34*b = 0 // - 32
-34*b = -32 // : -34
b = -32/(-34)
b = 16/17
b = 16/17
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