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-1 (-x - 6) = -2x
x + 6 = -2x
x + 2x = -6
3x = 6
x = 2
0,5x + 3 = -x
3 = -x - 0,5x
3=-1,5x
-3=1.5x
-2=x
1 1/2x=3 obie str podzielić przez 1,1/2
x=2