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a in (-oo:+oo)
7-a = 35-5*a // - 35-5*a
7-a-(-5*a)-35 = 0
5*a-a-35+7 = 0
4*a-28 = 0 // + 28
4*a = 28 // : 4
a = 28/4
a = 7
a = 7
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