(iii) 3x - 5y - 4 = 0 and 9x = 2y + 7
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3x - 5y - 4 = 0
3x - 5y = 0
3x - y = 0 +4
3x - 5y = 4+ 5
x - y = 9/3
after cancellation
x-y= 3
9x = 2y + 7
9x - 7 = 2y
2x/2 = y
after cancellation
x = y
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