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200-(64+a•12+4•11)=2•(50-24•2+13•5-9•5)

Răspuns :

200-(64+a*12+44)=2*(52+65-45)
200-(64+a*12+44)=144/+200
64+a*12+44=344/-64-44
12a=236/:12
a=
200 - ( 64 + a x 12 + 4 x 11 ) = 44
64 + a x 12 + 4 x 11 = 200 - 44
64 + a x 12 + 4 x 11 = 156
64 + a x 12 + 44 = 156
64 + a x 12 = 156 - 44
64 + a x 12 = 112
a x 12 = 112 - 64
a x 12 =48
a = 48 : 12
a = 4