Answer:
[tex]x = 3[/tex]
Step-by-step explanation:
[tex]10(3x - 5) = 40 \\ first \: you \: need \: to \: distribute \\ \\ 30x - 50 = 40 \\ add \: 50 \: from \: both \: sides \\ \\ 30x = 90 \\ divide \: both \: sides \: by \: 30 \\ \\ x = 3[/tex]
