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a in (-oo:+oo)
303/7 = (5/7)*a-(7*a)-7 // - (5/7)*a-(7*a)-7
7*a-((5/7)*a)+303/7+7 = 0
(-5/7)*a+7*a+303/7+7 = 0
44/7*a+352/7 = 0 // - 352/7
44/7*a = -352/7 // : 44/7
a = -352/7/44/7
a = -8
a = -8
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