i: \(\Leftrightarrow2x^2-x+2-2x^2=0\)
=>2-x=0
=>x=2
j: \(\Leftrightarrow36x^2-12x-36x^2+27x=30\)
=>15x=30
=>x=2
k: \(\Leftrightarrow5x^2-5+x-5x^2=3x-2\)
=>3x-2=x+5
=>2x=7
=>x=7/2
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