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Sa se rezolve ecuatia4(x+1)=20

Răspuns :

4(x+1) = 20 <=> 4x + 4 = 20 <=> 4x= 20-4 <=> 4x=16 => x=16:4 => x=4
4( x + 1 ) = 20  / : 4
4( x + 1 ) : 4 = 20 : 4
x + 1 = 5
x = 5 - 1 
x = 4