exam Maths Puzzle Numerical Ability

First of all would like to thank you for you help,I would like to know is this consider a complex equation or number and how would i solved it algebraically,
5-2/x-6=10-2x/x-6..

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exam Other Question
what is the name of the equation: am = a1 + (m-1)d and its companion: Sm = (m/2) (2a+(m-1)d)

this equation is related to the 1+2+3+4+5...100 problem that a young German student solve the inequality

5q+7<3(q+1)