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7(x+y)=8x
7x+7y=8x
7x-8x=7y
-x=-7y
x=7y
x/y=7y/y=7
x+y /2=4x/7
7x+7y=8x
7y=x
7=x/y
7(x+y)=8x
7x+7y=8x
7x-8x=7y
-x=-7y
x=7y