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x in (-oo:+oo)
2*x-(7*x)-(3/3) = 4 // - 4
2*x-(7*x)-(3/3)-4 = 0
2*x-7*x-4-1 = 0
-5*x-5 = 0 // + 5
-5*x = 5 // : -5
x = 5/(-5)
x = -1
x = -1
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