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-36x=-8/:(-36)
x=2/6=1/3
5x²=9-12x+4x²+9-6x+x²
18x=18/:18
x=1
4-8x+4x²=3x²+x²+2x+1
-5x²+4x²-10x+3=0
-x²-10x+3=0
Δ= b²-4ac
Δ=100-4(-1)3
Δ=112