Will mark brainliest

Step-by-step explanation:

(a)  We are to solve 4 = tx for x.  Isolate x by dividing both sides by t:

tx      4

=

 t       t

This yields the formula x = 4/t

(b) If gh = 7x and we want a formula for x, we divide both sides by  7 to isolate x:

gh       7x

=   or  x = gh/7

  7        7

(c) To solve 2d + x = w for x, subtract 2d from both sides.  We get:

x = w - 2d