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b in (-oo:+oo)
2 = -b/7-10 // + -b/7-10
2-(-b/7)+10 = 0
(1/7)*b+2+10 = 0
1/7*b+12 = 0 // - 12
1/7*b = -12 // : 1/7
b = -12/1/7
b = -84
b = -84
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