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For each of the following straight lines, determine the gradient and the y-intercept without drawing the line:
(a) 3y = 7x
(b) 2y = 6x + 1
(c) 7 - 2x = 4y
(d) 3y = 7
(e) 2y - 3x + 4 = 0
(f) 3(2x - 1) = 5y
(g) y + 3x + 7 = 0