exam Maths Puzzle Numerical Ability

my question is this

solve the quadratic equation using the formula

1/1+x -1/3-x = 6/35

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exam Other Question

Suppose T is equal to x over y and R is equal to w over z, show that xz plus yw all over yz-xw is equal to t plus r all over one minus tr. I am trying to solve 15-2/2poweredx3+(12/4x3)
I have tried working it backwards, forwards doing work in parenthesis and bringing it down. Can some help?