fast repply solve and check also
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x^2-x^2-5x-6/7x+1=2/3
-5x-6/7x+1=2/3
-15x-18=14x+2
-29x=20
x=20/-29
-5x-6/7x+1=2/3
-15x-18=14x+2
-29x=20
x=20/-29
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