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x in (-oo:+oo)
3-7*x = 3*x+33 // - 3*x+33
3-7*x-(3*x)-33 = 0
3-7*x-3*x-33 = 0
-10*x-30 = 0 // + 30
-10*x = 30 // : -10
x = 30/(-10)
x = -3
x = -3
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