book Maths Puzzle Numerical Ability

If 4aČ-bČ=54, then 4(2a+b)(2a-b)= ?

Thanks.

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(1) 2x+y=5
I am at a lost

6-y/y+4=4/4+y

6- y 4
___ = ____

y+4 4+y

and how do I check