Question

20÷a×7-12-6=5×2 cum se rezolva acest exercitiu?

Answer 1

20:ax7-12-6=10
20:ax7-12=10+6
20:ax7-12=16
20:ax7=16+12
20:ax7=28
20:a=28:7
20:a=4
a=20:4
a=5

Answer 2

20/a*7-18=10
140/a=28(amplificam cu a)
28a=140
a=140/28=5