book Maths Puzzle Numerical Ability

let us continue this look at introduction to matrices.The family of a friend of yours runs a neighborhood video rental store.Their rentals for the week of july 17 th are shown in t

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Please help me solve this problem.
19-(2x+3)=2(x+3)+x
I tried but my answer was wrong
19-2x+3=2x+6+x
22-2x=3x+6
22-2x+-3x=3x+-3x+6
22-5x=6
22-22-5x=22-6
-5x=-16
x=-16/5 If prices go down by 20% by what % does your purchasing power increase? (Purchasing power means the amount of goods you can purchase on a fixed amount of money.)