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201-(1+7×a-5):2=175
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Răspuns :

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