Solve
4.9
=
\displaystyle {4.9}=
4.9
=
0.4
\displaystyle {0.4}
0.4
b
\displaystyle {b}
b
-
0.7
\displaystyle {0.7}
0.7
for
b
\displaystyle {b}
b
.
b
\displaystyle {b}
b
=
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