x+1=3x+13
x-3x=13-1
-2x=12
x=12/-2
x=-6
comprobaciòn
-6+1=3(-6)+13
-5=-18+13
-5=-5
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x+1=3x+13
x-3x=13-1
-2x=12
x=12/-2
x=-6
comprobaciòn
x+1=3x+13
-6+1=3(-6)+13
-5=-18+13
-5=-5