I think x=10
4x=3x+10
subtract 3x from both sides and you get x=10
If you have

as your cost,
and you paid

,
then

.
Thankfully, most cellphone companies don't charge for minutes anymore!
There answer should well be -24 you take the sign from the greater digit and if it's different digits you subtract but I'm this case were dividing and -24 ÷4 = -6
It would be 59 if you are rounding to the one's nearest whole's number.
:)