Samsung keyboard has a known issue in a recent update where it has removed the additional characters such as the - minus button.
Fortunately, there is a quick solution to this
For android users, there is minus button (highlighted below) that they can select which will turn the figure into minus number.
Installing a new keyboard and setting it to default will remove the Samsung keyboard and the restricted options.
To Download - Click Here
It takes approxoitley 1 minute to install and begin using
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