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4/12 = x/5-10 // - x/5-10
4/12-(x/5)+10 = 0
31/3-1/5*x = 0 // - 31/3
-1/5*x = -31/3 // : -1/5
x = -31/3/(-1/5)
x = 155/3
x = 155/3
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