book Maths Puzzle Numerical Ability

FIND THE DOMAIN {3X+4}

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book Other Question

find all values of y which satisfy the equation

[(y+7)/(y+1)] +1
=[(y+7)/(y-1)] "solve for x"

1) 4x^2+12x+9=0
2) 7(x+2)^2=12
3) 2x^2-8x+5=0
4) (2x-5)/(x-3)=(4x+1)/(2x)

p.s. thanks