book Maths Puzzle Numerical Ability

i MADE The mistake when I was solving equations and did this


The equation 2(x-2) = x +3
First step in solving 2x-2=x+3

What error did I make? How could I avoided it? thanks

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book Other Question
Simplify the following expression and write answer with positive exponents only.


(a^-3)^2(a^4)divided by (a^-3)^-3 i need to state the value of the discriminant for the following equation of 2x squared= .7x + .o