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a in (-oo:+oo)
1-((1/5)*a) = (2/7)*a-(10/7) // - (2/7)*a-(10/7)
10/7-((1/5)*a)-((2/7)*a)+1 = 0
(-1/5)*a+(-2/7)*a+10/7+1 = 0
17/7-17/35*a = 0 // - 17/7
-17/35*a = -17/7 // : -17/35
a = -17/7/(-17/35)
a = 5
a = 5
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