3(х+4)+15=30
3х+12+15=30
3х+27=30
3х=30-27
3х=3
х=3÷3
х=1
3(x +4) = 30-15
3(x +4) =
x +4= 15:3
x +4=5
x=5 -4
x= 1
3(х+4)+15=30
3х+12+15=30
3х+27=30
3х=30-27
3х=3
х=3÷3
х=1
3(x +4) = 30-15
3(x +4) =
x +4= 15:3
x +4=5
x=5 -4
x= 1