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If a/b = c/d, then
b/a = d/c
If a/b = c/d, then
a/c = b/d
If a/b = c/d, then
(a + b)/b = (c + d)/d
If a/b = c/d, then
(a - b)/b = (c - d)/d
If a/b = c/d, then
(a + c)/b = (c + d)/d