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x in (-oo:+oo)
3-2*x = 7*x-15 // - 7*x-15
3-2*x-(7*x)+15 = 0
3-2*x-7*x+15 = 0
18-9*x = 0 // - 18
-9*x = -18 // : -9
x = -18/(-9)
x = 2
x = 2
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