=
20x=5x
20x - 5x = 0
15x = 0
x = 0
2x + 2 = 3x
2x - 3x = -2
-x = -2 //: -1
x = 2
6x = 2x - 1
4x = -1 //: 4
x = 1 1/4
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=
20x=5x
20x - 5x = 0
15x = 0
x = 0
2x + 2 = 3x
2x - 3x = -2
-x = -2 //: -1
x = 2
6x = 2x - 1
4x = -1 //: 4
x = 1 1/4