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x in (-oo:+oo)
3-(1.3*x) = (1/6)*x // - (1/6)*x
3-(1.3*x)-((1/6)*x) = 0
(-1/6)*x-1.3*x+3 = 0
3-1.46666667*x = 0 // - 3
-1.46666667*x = -3 // : -1.46666667
x = -3/(-1.46666667)
x = 2.04545454
x = 2.04545454
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