exam Maths Puzzle Numerical Ability

15/x-15/(x-2)=-2

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exam Other Question

Is 7 a solution of the equation 4x-2=3x+5? Please help me solve my assignment..
my questions are:

1). -3 1/4 + 1/2 =

2). 3 + -4/5 =

3). -2 1/8 + -1 1/4 =

4). -25 + -17/3 =

thank you...