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a in (-oo:+oo)
13/7 = (-4/7)*a-(2*a)+7 // - (-4/7)*a-(2*a)+7
2*a-((-4/7)*a)+13/7-7 = 0
(4/7)*a+2*a+13/7-7 = 0
18/7*a-36/7 = 0 // + 36/7
18/7*a = 36/7 // : 18/7
a = 36/7/18/7
a = 2
a = 2
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