a–4by 7–a=5–a by3+1
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a-4/7-a=5-a/3+1 -4/7=5-a/4. -4/7*4=5-a. -16/7=5-a. (-16/7)-5=-a (-16)+(-5*7)/7=-a. -41/7=-a 41/7=a
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