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-x+ 2 x = 6 + 4
x= 10
3y + 18 - y = 2y + 18
3y - y - 2y = 18 -18
y= 0
x - 7 - 6x - 10 = 3
x - 6x = 3 + 10 + 7
- 5x = 20 /: (-5)
x= - 4
-4x+3x=6+4
-1x=10
x=-10
b) 3y+18-y=2y+18
18=18
c) x-7-6x-10=3
5x=-14
x= -5/14