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a in (-oo:+oo)
-167/70 = (5/7)*a+4*a-(1/2) // - (5/7)*a+4*a-(1/2)
1/2-((5/7)*a)-(4*a)-167/70 = 0
(-5/7)*a-4*a-167/70+1/2 = 0
-33/7*a-66/35 = 0 // + 66/35
-33/7*a = 66/35 // : -33/7
a = 66/35/(-33/7)
a = -2/5
a = -2/5
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