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a in (-oo:+oo)
-0.7 = a/3 // - a/3
-(a/3)-0.7 = 0
-1/3*a-0.7 = 0 // + 0.7
-1/3*a = 0.7 // : -1/3
a = 0.7/(-1/3)
a = -2.10000002
a = -2.10000002
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