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a in (-oo:+oo)
(3/7)*a-((2/5)*a)-2 = -81/35 // + -81/35
(3/7)*a-((2/5)*a)-(-81/35)-2 = 0
(3/7)*a+(-2/5)*a+81/35-2 = 0
1/35*a+11/35 = 0 // - 11/35
1/35*a = -11/35 // : 1/35
a = -11/35/1/35
a = -11
a = -11
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