a: =>15:(x+2)=30:10=3
=>x+2=5
hay x=3
b: =>4x+2=65-1=64
=>x+2=3
hay x=1
a: =>15:(x+2)=30:10=3
=>x+2=5
hay x=3
b: =>4x+2=65-1=64
=>x+2=3
hay x=1
a: =>15:(x+2)=30:10=3
=>x+2=5
hay x=3
b: =>4x+2=65-1=64
=>x+2=3
hay x=1
a: =>15:(x+2)=30:10=3
=>x+2=5
hay x=3
b: =>4x+2=65-1=64
=>x+2=3
hay x=1