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2/3 x = -4
x= -4 * 3/2
x=-6
2/3x+4=0
2/3x=-4/x3/2
x=-6
y=0<=> x∈{-6}
Przyrównujemy do 0
0 = 2/3x + 4
-2/3 x = 4 /*3
-2x = 12 /:(-2)
x = -6