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b in (-oo:+oo)
1.2*b-3 = (-1/3)*b+20 // - (-1/3)*b+20
1.2*b-((-1/3)*b)-20-3 = 0
1.2*b+(1/3)*b-20-3 = 0
1.53333333*b-23 = 0 // + 23
1.53333333*b = 23 // : 1.53333333
b = 23/1.53333333
b = 15.00000003
b = 15.00000003
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