How to make x the subject?

$A-x=(xr)/t$

Mar 13, 2017

$x = (At)/(r+t)$

Given:

$A-x=(xr)/t$

Mutiply both sides of the equation by $t$ to get:

$At-xt = xr$

Add $xt$ to both sides to get:

$At = xr+xt$

$color(white)(At) = x(r+t)$

Divide both ends by $(r+t)$ and transpose to get:

$x = (At)/(r+t)$

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