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(a +6×2+5)-2×(17-7)=2×5+6×5

Răspuns :

(a + 6x2+5)-2x(17-7)=2x5+6x5
(a+12+5)-2x10=10+30
(a+17)-20=40
(a+17)=40+20
a+17=60
a=60-17
a=43 
Sper ca te-am ajuat! :)