Răspuns :
5x+1+5x+1-5x=145
5x+2=145
5x=145-2
5x=143
x=143:5
x=28,6
Verificare:
143+1+143+1-143=143+2=145
5x+2=145
5x=145-2
5x=143
x=143:5
x=28,6
Verificare:
143+1+143+1-143=143+2=145