exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

I need to solve:
3x/7 - 5x/3 = 2/21

Thanks,
Sher

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exam Other Question

k(-2,-8)
y(8,3)
ky Which intervals are decreasing?
f(x) = x^3 � 12 x^2 + 36x + 1
I came up with (-6, -2), is this correct?

Thank you for inspecting this problem!

Also, I am trying to find t