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x in (-oo:+oo)
3*x-(7*x)-4 = -8 // + 8
3*x-(7*x)-4+8 = 0
3*x-7*x-4+8 = 0
4-4*x = 0 // - 4
-4*x = -4 // : -4
x = -4/(-4)
x = 1
x = 1
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