Solve for φ
\phi =-4
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\phi -8-3\phi =0
Subtract 3\phi from both sides.
-2\phi -8=0
Combine \phi and -3\phi to get -2\phi .
-2\phi =8
Add 8 to both sides. Anything plus zero gives itself.
\phi =\frac{8}{-2}
Divide both sides by -2.
\phi =-4
Divide 8 by -2 to get -4.
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