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(87/3)/4 = x/5 // - x/5
(87/3)/4-(x/5) = 0
29/4-1/5*x = 0 // - 29/4
-1/5*x = -29/4 // : -1/5
x = -29/4/(-1/5)
x = 145/4
x = 145/4
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