## College Algebra 7th Edition

$T=\dfrac{wd}{rH}$
Multiply M to both sides of the equation to obtain: $M \cdot r = \dfrac{12}{M} \cdot M \\Mr = 12$ Divide $rH$ to both sides of the equation to obtain: $\dfrac{wd}{rH} = \dfrac{rTH}{rH}$ Cancel common factors to obtain: $\dfrac{wd}{rH} = T$