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x in (-oo:+oo)
-4*x-(3*x)-5 = 16 // - 16
-4*x-(3*x)-16-5 = 0
-4*x-3*x-16-5 = 0
-7*x-21 = 0 // + 21
-7*x = 21 // : -7
x = 21/(-7)
x = -3
x = -3
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