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-2*{3-[-(2*3+6:x)*(-2)-7]}=16

Răspuns :

-2*{3-[-(2*3+6:x)*(-2)-7]}=16 | / (-2) =>
=> 3-[-(6+6/x)*(-2)-7]= -8 | -3 =>
=> -[(-6-6/x) *(-2)-7]= -11 =>
=> -( 12+12/x-7)= -11 =>
=> -(5 +12/x) = -11=>
=> -(12/x) - 5= -11 | +5 =>
=> -(12/x) = -6 | / (-1) =>
=> 12/x = 6 | *x =>
=> 12=6*x | / 6 =>
=> x= 2