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[tex]12 + 1.5x = 15 + 0.5x[/tex]
Subtract sides 0.5x
[tex]12 + 1.5x - 0.5x = 15 + 0.5x - 0.5x \\ [/tex]
[tex]12 + 1x = 15[/tex]
[tex]x + 12 = 15[/tex]
Subtract sides 12
[tex] x + 12 - 12 = 15 - 12[/tex]
[tex]x = 3[/tex]
Done...
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