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zał 4x-3≠0⇒x≠3/4 i 7-x≠0⇒x≠7
D=R/{3/4,7}
14x-2x²+35-5x=12x²+12x-9x-9
9x-2x²+35=12x²+3x-9
14x²-6x-44=0/:2
7x²-3x-22=0
w zał
Δ=b²-4ac
Δ=9-4·7·(-22)=9+616=625
√Δ=25
x₁=(-b-√Δ)/2a=(3-25)/14= -²²/₁₄= -¹¹/₇
x₂=(-b-√Δ)/2a=(3+25)/14=²⁸/₁₄= 2