10=2x+3,50 |-3,50
6,50=2x |:2
3,25=x
10=2x+7 |-7
3=2x |:2
1,5=x
You didnt say how many bakery she wants to buy, so i did one inequality for 1 bakery anderen for the maximum of 2.
The answer should be 31/10
If you need an equation it is -3.4x=21.5
You simply divide both sides by -3.4 to get x=-6.32
if that's not right then just get on a calculator and calculate by doing what I said to divide
If your asking to multiply 9x5 then the anwser is 45.