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a in (-oo:+oo)
4*(-7*a-5) = -48 // + 48
4*(-7*a-5)+48 = 0
4*(-7*a-5)+48 = 0
28-28*a = 0
28-28*a = 0
28-28*a = 0 // - 28
-28*a = -28 // : -28
a = -28/(-28)
a = 1
a = 1
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