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b in (-oo:+oo)
(-1/2)*b+(4/7)*b+8/9 = 374/441 // - 374/441
(-1/2)*b+(4/7)*b+8/9-(374/441) = 0
(-1/2)*b+(4/7)*b+8/9-374/441 = 0
1/14*b+2/49 = 0 // - 2/49
1/14*b = -2/49 // : 1/14
b = -2/49/1/14
b = -4/7
b = -4/7
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