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-5x=9-1
-5x=8 /: (-5)
x=1,6
6x+7+1-5x=0
6x+ (-5x)= -7 + (-1)
x=-8
-5x=-9-1
-5x=-10/:(-5)
x= 2
b)6x+7+1-5x
6x-5x=-7-1
x=-8
c)2x+1=2x-6
2x -2x= -6-1
0x=-7
d)x+3=x
x-x=-3
0x=-3
e) -2a+6=12-4a
-2a+4a=12-6
2a=6/:2
a=3