Start with
[tex]4x - 10 = 18[/tex]
Add 10 to both sides:
[tex]4x - 10+10 = 18+10[/tex]
This cancels the "-10" on the left hand side:
[tex]4x = 28[/tex]
Divide both sides by 4:
[tex]\dfrac{4x}{4} = \dfrac{28}{4}[/tex]
This cancels the 4 on the left hand side:
[tex]x = 7[/tex]
4x - 10 = 18| + 10
4x - 10 + 10 = 18 + 10
4x = 28| ÷ 4
4x ÷ 4 = 28 ÷ 4
x = 7
