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Solve for a
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Solve for c
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cm=a+mam
Multiply both sides of the equation by m.
cm=a+m^{2}a
Multiply m and m to get m^{2}.
a+m^{2}a=cm
Swap sides so that all variable terms are on the left hand side.
\left(1+m^{2}\right)a=cm
Combine all terms containing a.
\left(m^{2}+1\right)a=cm
The equation is in standard form.
\frac{\left(m^{2}+1\right)a}{m^{2}+1}=\frac{cm}{m^{2}+1}
Divide both sides by 1+m^{2}.
a=\frac{cm}{m^{2}+1}
Dividing by 1+m^{2} undoes the multiplication by 1+m^{2}.