Solve for R_A
R_{A}=14
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\left(-R_{A}\right)\times 12-216+384=0
Multiply 64 and 6 to get 384.
\left(-R_{A}\right)\times 12+168=0
Add -216 and 384 to get 168.
\left(-R_{A}\right)\times 12=-168
Subtract 168 from both sides. Anything subtracted from zero gives its negation.
-R_{A}=\frac{-168}{12}
Divide both sides by 12.
-R_{A}=-14
Divide -168 by 12 to get -14.
R_{A}=14
Multiply both sides by -1.
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