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4x-2y=8 ---> -2y=8-4x multiply it by -1 so that the negative 2 would be positive then it would be like this --> 2y=-8+4x then divide it by 2. magiging y=-4+2x. sa -10x+5y=-20 nman, multiply it by -1 para maging 10x-5y=20. 10x-5(-4+2x)=20 10x+20-10x=20 10x-10x=20-20 0=0
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