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a in (-oo:+oo)
4*(-(4*a)-7) = -28 // + 28
4*(-(4*a)-7)+28 = 0
4*(-4*a-7)+28 = 0
4*(-4*a-7)+28 = 0
-16*a = 0
-16*a = 0
-16*a = 0 // : -16
a = 0
a = 0
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