Answer:Your answer is 63x.
Step-by-step explanation:You see negative ten times negative seven is 70 so after that subtracting 3 from 10 would be seven Wich would equal 63 oh and if ur wondering about the x since it's a variable without a number then in any equation the x or any other variable would stay next to your final answer for example this equations final answer is 63 so all I have to do is add the x to it's side Wich gives us the answer of 63x.