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2(7x + 1)= 5(2x + 3)+ 1

Răspuns :

14x+1=10x+15+1  
14x-10x=15+1-1 
4x=15  
x=15 supra 4
14x + 2 = 10x +15 + 1 |-10x
4x + 2 = 16 |-2
4x = 14 |:4
x = 3.5