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B) R= x=-2
C) R= x=1
D) R= x=-3
3x-12x=12
-9x=12
x=12/-9
x=-4/3
x = -4/3= -1 1/3 = -1.333333333
9x+3-2x=-11
7x+3=-11
7x=-11-3
7x=-14
x=-14/7
x=-2
8x+2-3x=7
5x+2=7
5x=7-2
5x=5
x=5/5
x=1
x+2x=-9
3x=-9
x=-9/3
x=-3