7 times what divided by 12 equals 4.2

The equation you need is 7x/12 = 4.2

the first thing you do is multiply 4.2 x 12 (which equals 50.4) to get 7x by itself.

Then you are left with 7x = 50.4

then you need to divide 50.4 by 7 (so 50.4/7)

what does that equal?

it equal 7.2

so x = 7.2