1.
1)20-4x=3x-1
-4x-3x= -1-20
-7x=-21
x=3
2) 5x-5=4x+3
5x-4x=3-5
x=8
2.
1) -x=5-3
-x=2
x=-2
2)-5x=-6
x=6/5
3)x+3=7
x=7-3
x=4
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Answers & Comments
1.
1)20-4x=3x-1
-4x-3x= -1-20
-7x=-21
x=3
2) 5x-5=4x+3
5x-4x=3-5
x=8
2.
1) -x=5-3
-x=2
x=-2
2)-5x=-6
x=6/5
3)x+3=7
x=7-3
x=4