Solve for
x
\displaystyle {x}
x
:
∑
n
=
1
∞
7
x
3
n
=
25
\displaystyle {\sum_{{{n}={1}}}^{{\infty}}}{7}{x}^{{{3}{n}}}={25}
n
=
1
∑
∞
7
x
3
n
=
25
x
=
\displaystyle {x}=
x
=
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity