book Maths Puzzle Numerical Ability

5x-7 for x=0,1,2,3

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book Other Question

THIS IS THE EQUATION
12X-X=15180
I AM NOT IN SCHOOL AND JUST NEED SOME HELP WITH THIS
THANKS,
JOHN
please help solve

a over a+1 + 2a+4 over a^2-3a-4 = 2 over a-4
show work