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4-x=13
-x=13-4
-x=9/*(-1)
x= -9
2.
-x-3=x-4
-x-x= -4+3
-2x= -1/:(-2)
x=1/2
3.
3x-6=x
3x-x=6
2x=6/:2
x=3
4.
-2x-1-3x-1=0
-2x-3x=1+1
-5x=2/:(-5)
x= -2/5
-x = 13-4
-x = 9
x = -9
-x-3 = x-4
x+x-4 = -3
2x = -3+4
2x = 1
x = ¹/₂
3x-6 = x
3x-x = 6
2x = 6
x = 3
-2x-1-3x-1 = 0
-5x-2 = 0
-5x = 2
x = -²/₅