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x in (-oo:+oo)
-19 = 7*x-(3*x)-3 // - 7*x-(3*x)-3
3*x-(7*x)-19+3 = 0
3*x-7*x-19+3 = 0
-4*x-16 = 0 // + 16
-4*x = 16 // : -4
x = 16/(-4)
x = -4
x = -4
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