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9x²-6x+1≤2x+2
9x²-6x-2x+1-2≤0
9x²-8x-1≤0
Δ=b²-4ac=(-8)²-4·9·(-1)=64+36=100
√Δ=10
x₁=(-b+√Δ):2a=(8+10):18=1
x₂=(-b-√Δ):2a=(8-10):18=-1/9
x∈<-1/9;1>