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a in (-oo:+oo)
8*a-48 = (48/7)*a // - (48/7)*a
8*a-((48/7)*a)-48 = 0
8*a+(-48/7)*a-48 = 0
8/7*a-48 = 0 // + 48
8/7*a = 48 // : 8/7
a = 48/8/7
a = 42
a = 42
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