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a in (-oo:+oo)
(-1/5)*a+9/10 = (-3/4)*a+2/5 // - (-3/4)*a+2/5
(-1/5)*a-((-3/4)*a)+9/10-(2/5) = 0
(-1/5)*a+(3/4)*a+9/10-2/5 = 0
11/20*a+1/2 = 0 // - 1/2
11/20*a = -1/2 // : 11/20
a = -1/2/11/20
a = -10/11
a = -10/11
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