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h) [(a+428:4)×2+5]×2-186=800

[(a+107)×2+5]×2-186=800

[(a+107)×2+5]×2=800+186

[(a+107)×2+5]×2=986

(a+107)×2+5=986:2

(a+107)×2+5=493

(a+107)×2=493-5

(a+107)×2=488

a+107=488:2

a+107=244

a=244-107

a=137

Succes!;)