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Find the co-ordinates of the point where each of the following lines cuts the x-axis:
(a) y = 7x - 3
(b) y = -(3x + 2)
(c) y = #1/3#x + 4
(d) y = 0.5 - 0.8x
(e) y = mx + c
(f) ax+by+c= 0 (a#!=# 0)