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x in (-oo:+oo)
1-4*x = 7*x-65 // - 7*x-65
1-4*x-(7*x)+65 = 0
1-4*x-7*x+65 = 0
66-11*x = 0 // - 66
-11*x = -66 // : -11
x = -66/(-11)
x = 6
x = 6
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