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5x - x = 6 - 2
4x = 4
x = 4/4
x = 1
---------------------------------
20x + 2 = 7x
20x - 7x = - 2
13x = - 2
x = - 2/13
-----------------------------------
3x + 1 = 2x + 4
3x - 2x = 4 - 1
x = 3
4x=4
x=1
20x+2=7x
13x=-2
3x+1=2x+4
x=3