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x in (-oo:+oo)
8 = 7*x-4*x-4 // - 7*x-4*x-4
4-(-4*x)-(7*x)+8 = 0
4*x-7*x+4+8 = 0
12-3*x = 0 // - 12
-3*x = -12 // : -3
x = -12/(-3)
x = 4
x = 4
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