How to calculate this equation

I don't know of a calculator that can do that for you, its transposition, you have to get x on its own to find its value which in this case is 0.9

what you do to one side you do the oposite to the other for eg
if 10x+2+45-56=0 then
10x+2+45=56 we moved -56 over the = to make it +56 then
10x+2=56-45 then
10x=56-45-2 which is the same as 10x=9 then

10x means 10 multiplied by x, so to move the 10 over it becomes division.

x=9/10
x=0.9