[tex]x+12=3x[/tex]
[tex]-7-x=3x+17[/tex]
x-3x=-12
-2x=-12
x=6
-x-3x=17+7
-4x=24
x=-6
x+12=3x
2x=12
-7-x=3x+17
4x=24
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x-3x=-12
-2x=-12
x=6
-x-3x=17+7
-4x=24
x=-6
x+12=3x
2x=12
x=6
-7-x=3x+17
4x=24
x=6