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b in (-oo:+oo)
2*(6*b+3) = 150 // - 150
2*(6*b+3)-150 = 0
2*(6*b+3)-150 = 0
12*b-144 = 0
12*b-144 = 0
12*b-144 = 0 // + 144
12*b = 144 // : 12
b = 144/12
b = 12
b = 12
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