Explanation:
(3x + 5y - 7r)/(z + t) = 9p
3x + 5y - 7r = 9p(z + t)
3x + 5y - 7r = 9pz + 9pt
3x = 9pz + 9pt - 5y + 7r
x = (9pz + 9pt -5y + 7r)/3
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