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a in (-oo:+oo)
-4*a-7 = -19/3 // + -19/3
-4*a-(-19/3)-7 = 0
19/3-4*a-7 = 0
-4*a-2/3 = 0 // + 2/3
-4*a = 2/3 // : -4
a = 2/3/(-4)
a = -1/6
a = -1/6
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