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x in (-oo:+oo)
x/5-(x/4) = 7/4 // - 7/4
x/5-(x/4)-(7/4) = 0
x/5-(x/4)-7/4 = 0
-1/20*x-7/4 = 0 // + 7/4
-1/20*x = 7/4 // : -1/20
x = 7/4/(-1/20)
x = -35
x = -35
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