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2x=21+6/10x
2x-0,6x=21+1,4x=21
x=15
2.
x+252=1/x+10
x²+10x+252x+2520=0
x*(x+10)+252*(x+10)=1+x²+262x+2519=0
Δ=262²-4*1*2519=58568
√Δ=242
x1=-262-242/2=-252
x2=-262+242/2=-10