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x in (-oo:+oo)
33 = 2*x+7*x-3 // - 2*x+7*x-3
3-(2*x)-(7*x)+33 = 0
3-2*x-7*x+33 = 0
36-9*x = 0 // - 36
-9*x = -36 // : -9
x = -36/(-9)
x = 4
x = 4
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