`x:0,25+x xx11=39`
`x xx4 + x xx11=39`
`x xx(4+11)=39`
`x xx15=39`
`x =13/5`
X:0,25+X x 11 =39
=> X x 4 + X x 11 =39
=> X x( 4+11) =39
=> X x 15 =39
=> X =39 :15
=> X=2,6
= X x 4 + X x 11 = 39
= X x 15 = 39
= 39 / 15 = 2,6
\(x\) : 0,25 + \(x\) x 11 = 39
\(x\) x 4 + \(x\) x 11 = 39
\(x\) x (4 + 11) = 39
\(x\) x 15 = 39
\(x\) = 39 : 15
\(x\) = 2,6