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a in (-oo:+oo)
4*a-5 = (6/7)*a+31/7 // - (6/7)*a+31/7
4*a-((6/7)*a)-(31/7)-5 = 0
4*a+(-6/7)*a-31/7-5 = 0
22/7*a-66/7 = 0 // + 66/7
22/7*a = 66/7 // : 22/7
a = 66/7/22/7
a = 3
a = 3
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