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a in (-oo:+oo)
-299/100 = (-3/5)*a-((1/2)*a)-2 // - (-3/5)*a-((1/2)*a)-2
(1/2)*a-((-3/5)*a)-299/100+2 = 0
(3/5)*a+(1/2)*a-299/100+2 = 0
11/10*a-99/100 = 0 // + 99/100
11/10*a = 99/100 // : 11/10
a = 99/100/11/10
a = 9/10
a = 9/10
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