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Aflati x din:
a) (12+x)+14=4x-4
b) (3x+2)÷4-2=3
c) [(x+3)×3+4]×3+3=102
d) 5x÷2=2525


Răspuns :

a) (12+x)+14=4x-4 26+x=4x-4 26+4=4x-x 30=3x x=30:3 x=10 b) (3x+2):4-2=3 (3x+2):4=2+3 (3x+2):4=5 (3x+2)=4•5 (3x+2)=20 3x=20-2 3x=18 x=6