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-5x=1+7
-5x=8|:(-5)
x=-1,6
7x-21=5x
7x-5x=21
2x=21|:2
x=10,5
6y-13= -52
6y=-52+13
6y=-39|:6
y=-6,5
4x-4=3
4x=3+4
4x=7|:4
x=1¾
3c+2= -70
3c=-70-2
3c=-72|:3
c=-24
33-4x=4x
-4x-4x=-33
-8x=-33|:(-8)
x=4⅛
5- 10x= -2x
-10x+2x=-5
-8x=-5|:(-8)
x=5/8