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7-[ 5200:13-5 x( 360-2 x X )]:20=2


Răspuns :

7-[ 40-5x( 360 -2X)]=20x2
7- ( 40 - 1800 +10x) =40
7 -( -1760 +10X) =40
7+1760-10X=40
1767 -10X =40
-10X= 40-1767
-10X = -1727
X= +172.7