[tex]3x + 10 - x= x + 20 - x[/tex]
[tex]2x + 10 - 10= 20 - 10[/tex]
[tex]2x = 10[/tex]
[tex] \frac{2x}{2} = \frac{10}{2} [/tex]
[tex]x = 5[/tex]
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[tex]3x + 10 - x= x + 20 - x[/tex]
[tex]2x + 10 - 10= 20 - 10[/tex]
[tex]2x = 10[/tex]
[tex] \frac{2x}{2} = \frac{10}{2} [/tex]
[tex]x = 5[/tex]