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x in (-oo:+oo)
3*x+7 = 7*x-25 // - 7*x-25
3*x-(7*x)+7+25 = 0
3*x-7*x+7+25 = 0
32-4*x = 0 // - 32
-4*x = -32 // : -4
x = -32/(-4)
x = 8
x = 8
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