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x in (-oo:+oo)
3*x+3 = 7*x-17 // - 7*x-17
3*x-(7*x)+3+17 = 0
3*x-7*x+3+17 = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x = 5
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