Let's solve for x ~
[tex]\qquad \sf \dashrightarrow \: 7x + 3 = 24[/tex]
[tex]\qquad \sf \dashrightarrow \: 7x = 24 - 3[/tex]
[tex]\qquad \sf \dashrightarrow \: 7x = 21[/tex]
[tex]\qquad \sf \dashrightarrow \: x = 21 \div 7[/tex]
[tex]\qquad \sf \dashrightarrow \: x = 3[/tex]
