exam Maths Puzzle Numerical Ability

1)15x-2-14x+8=13 2)-5(3x+4)+6=25 3)5(y-6)+(y+2)=44=y 4)-5 3x-4y+1
x= x= it has a red

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It says:solve and check the following equation for x....

x/x-2 minus x+1/x = 8/x^2-2x

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ac Given f (x) = ex, find f (-4.1) accurate to four significant digits