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3x-6=x+3
2x=9
x=4,5
b)(x+1)/(x-1)= -1
-x+1=x+1
2x=0
x=0
c)(2x-3)/(x+1)=-x/2
-x²-x=4x-6
x²+5x-6=0
Δ=25-4*(-6)
Δ=49
√Δ=7
x1= (-5+7)/2 = 1 lub x2= (-5-7)/2 = -6
d)1/(x-2)=2/(x+3)
x+3=2x-4
x=7