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

Simplify the fraction -{2x/(-xy} completely. 2x2 and 3x3 Systems: answer has to be in ordered pairs, or ordered triples.

Question 1. 2(x-3y)+3(y-2)= 4(x-y)-5
3/2x - 5/6y = -1

Question 2. 2x - y + z= -4