Solve the equation.
9
x
+
3
x
−
6
x
=
−
138
+
174
\displaystyle {9}{x}+{3}{x}-{6}{x}=-{138}+{174}
9
x
+
3
x
−
6
x
=
−
138
+
174
x
=
\displaystyle {x}=
x
=
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