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x in (-oo:+oo)
8-7*x = 4*x-3 // - 4*x-3
3-7*x-(4*x)+8 = 0
3-7*x-4*x+8 = 0
11-11*x = 0 // - 11
-11*x = -11 // : -11
x = -11/(-11)
x = 1
x = 1
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