괄호를풀면, 2x-[3x-y-{-x+2y-2x+3y}]=ax+by, 2x-(3x-y+x-2y+2x-3y)=ax+by, 2x-3x+y-x+2y-2x+3y=ax+by, -4x+6y=ax+by, 즉 a=-4,b=6이므로 a+b=2입니다.
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