Răspuns :
81-(x*7)=32
x*7=81-32
x*7=49
x=49:7
x=7
72:(x*4)=9
x*4=72:9
x*4=8
x=8:4
x=2
45+(6*x)=99
6*x=99-45
6*x=54
x=54:6
x=9
x*7=81-32
x*7=49
x=49:7
x=7
72:(x*4)=9
x*4=72:9
x*4=8
x=8:4
x=2
45+(6*x)=99
6*x=99-45
6*x=54
x=54:6
x=9
81-(x*7)=32
81-7x=32
81-32=7x
49=7x
x=7
72/4x=9
72=36x
x=2
45+6x=99
6x=99-45
6x=54
x=9
81-7x=32
81-32=7x
49=7x
x=7
72/4x=9
72=36x
x=2
45+6x=99
6x=99-45
6x=54
x=9