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b in (-oo:+oo)
35 = 3*b+2*b+10 // - 3*b+2*b+10
35-(3*b)-(2*b)-10 = 0
35-3*b-2*b-10 = 0
25-5*b = 0 // - 25
-5*b = -25 // : -5
b = -25/(-5)
b = 5
b = 5
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