X:9+27=40
X:9=40-27
X:9=13
X=13*9
X=117
4x+21=57
4x=57-21
4x=36
x=36/4
х=9
x:12+38=43
x:12=43-38
x:12=5
х=5*12
х=60
X:9+27=40
X:9=40-27
X:9=13
X=13*9
X=117
4x+21=57
4x=57-21
4x=36
x=36/4
х=9
x:12+38=43
x:12=43-38
x:12=5
х=5*12
х=60