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a in (-oo:+oo)
a-((2/7)*a)+2/5 = 139/35 // - 139/35
a-((2/7)*a)+2/5-(139/35) = 0
a+(-2/7)*a+2/5-139/35 = 0
5/7*a-25/7 = 0 // + 25/7
5/7*a = 25/7 // : 5/7
a = 25/7/5/7
a = 5
a = 5
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