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x in (-oo:+oo)
7-(5*x) = 3*x-33 // - 3*x-33
7-(5*x)-(3*x)+33 = 0
7-5*x-3*x+33 = 0
40-8*x = 0 // - 40
-8*x = -40 // : -8
x = -40/(-8)
x = 5
x = 5
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