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b in (-oo:+oo)
20 = 7*b+3*b+10 // - 7*b+3*b+10
20-(7*b)-(3*b)-10 = 0
20-7*b-3*b-10 = 0
10-10*b = 0 // - 10
-10*b = -10 // : -10
b = -10/(-10)
b = 1
b = 1
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