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b in (-oo:+oo)
(1/3)*b-((1/4)*b)-7/8 = -97/120 // + -97/120
(1/3)*b-((1/4)*b)-7/8-(-97/120) = 0
(1/3)*b+(-1/4)*b-7/8+97/120 = 0
1/12*b-1/15 = 0 // + 1/15
1/12*b = 1/15 // : 1/12
b = 1/15/1/12
b = 4/5
b = 4/5
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