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b in (-oo:+oo)
(1/3)*b+2.5 = 10 // - 10
(1/3)*b-10+2.5 = 0
1/3*b-7.5 = 0 // + 7.5
1/3*b = 7.5 // : 1/3
b = 7.5/1/3
b = 22.50000023
b = 22.50000023
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