which steps could be used to solve x+3.6= - 1.7

To solve this question, we need to get x by itself. We can do that by subtracting 3.6 from each side. But, adding a negative is the same thing as subtracting a positive number. That means that you could also add -3.6 to both sides.
For this case we have the following equation:
x + 3.6 = -1.7
The first step in solving the equation is to subtract 3.6 on both sides of the equation.
We have then:
x + 3.6-3.6 = -1.7-3.6
Then, we rewrite the left side of the equation:
x = -1.7-3.6
Finally we do the algebraic sum on the right side of the equation:
x = -5.3
Answer:
subtract 3.6 from both sides