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b in (-oo:+oo)
(-1/5)*b-((6/7)*b)-2 = -383/210 // + -383/210
(-1/5)*b-((6/7)*b)-(-383/210)-2 = 0
(-1/5)*b+(-6/7)*b+383/210-2 = 0
-37/35*b-37/210 = 0 // + 37/210
-37/35*b = 37/210 // : -37/35
b = 37/210/(-37/35)
b = -1/6
b = -1/6
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