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a in (-oo:+oo)
a+1 = (2/7)*a+43/28 // - (2/7)*a+43/28
a-((2/7)*a)-(43/28)+1 = 0
a+(-2/7)*a-43/28+1 = 0
5/7*a-15/28 = 0 // + 15/28
5/7*a = 15/28 // : 5/7
a = 15/28/5/7
a = 3/4
a = 3/4
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