\(\left(x\times4+x\times6\right):25=42\)
\(\left(x\times4+x\times6\right)=42\times25\)
\(\left(x\times4+x\times6\right)=1050\)
\(x\times\left(4+6\right)=1050\)
\(x\times10=1050\)
\(x=1050:10\)
\(x=105\)
(2x + 10):25= 42
(2x+10)=42×25
(2x+10)=1050
2x=1050-10
2x=1040
=>x=1040:2=520