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-4=10x
x=-(10/4)-ułamek
x=-2,5
Pozdrawiam
4/2x - 12 = 8 + 12x
2x - 12x = 8 + 12
-10x = 20 /: (-10)
x = -2
2x - 12 = 8 + 12x
-12 - 8 = 12x - 2x
-20 = 10x /:10
x=-2