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-X-2X=6+4
-3X=10/(-3)
X=-3 1/3
b) 3y+18-y=2y-2x
3y-y-2y+2x=-18
2x=-18/2
x=9
c)x-7-6x-10=3
-5x=3+7
-5x=10/-5
x=-2