<PRE><B>Question 62385</B>
5n+12=2n
5n-2n=-12
3n=-12
n=-12/3
n=-4
proof
5*-4+12=2*-4
-20+12=-8
-8=-8
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6(x+3)+3x=3(x-2)
6x+18+3x=3x-6
6x+3x-3x=-6-18
6x=-24
x=-24/6
x=-4
proof
6(-4+3)+3*-4=3(-4-2)
6(-1)-12=3*-6
-6-12=-18
-18=-18</PRE>