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201- (1+7xa-5): 2 = 175

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Cocirmariadenis
201 - (1 + 7 x a - 5 ) : 2 = 175
( 1 + 7 x a - 5 ) : 2 = 201 - 175
( 1 + 7 x a - 5 ) : 2= 26
1 + 7 x a - 5 = 26 x 2
1 + 7 x a - 5 = 52
1 + 7 x a = 52 + 5 
1 + 7 x a= 57
7 x a = 57 - 1
7 x a = 56
a = 56 : 7 
a = 8

Primăvară2017
201- (1+7xa-5): 2 = 175
(1+7xa-5): 2=201-175
(1+7xa-5): 2=26
1+7xa-5=26×2
1+7xa-5=52
1+7xa=52+5
1+7xa=57
7xa=57-1
7xa=56
a=56:7
a=8