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x in (-oo:+oo)
2*(7-(3*x)) = 1/4 // - 1/4
2*(7-(3*x))-(1/4) = 0
2*(7-3*x)-1/4 = 0
(2*4*(7-3*x))/4-1/4 = 0
2*4*(7-3*x)-1 = 0
55-24*x = 0
(55-24*x)/4 = 0
(55-24*x)/4 = 0 // * 4
55-24*x = 0
55-24*x = 0 // - 55
-24*x = -55 // : -24
x = -55/(-24)
x = 55/24
x = 55/24
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