3x-y-=3,9x-3y=9 by using substitution method
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3x - y = 3
9x - 3y = 9
3(3x - y )=3(3)
3 get cancelled
3x - y = 3
9x - 3y = 9
3(3x - y )=3(3)
3 get cancelled
3x - y = 3
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