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4x-3x=6+1
x=7
B) 7-x=(15+x)-(2x+8)
7-x=15+x-2x-8
-x-x+2x=15-8-7
0=0
C) 3x + x + (7+4x) =
4x+7+4x=
8x=-7
x=-7/8