book Maths Puzzle Numerical Ability

please help me with this.

4x + 2 = -28.4

will you show me how you did it?

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book Other Question

Can you please help me with this problem: Find each value given that f(x)=2x+1
f(3)+f(2).
And: Find the domain and range of f(x)= 1/x-4. I know the domain is x and the range is y, but how do I figure it on a fraction?
Thank You 4Y(-3XY)