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x in (-oo:+oo)
1/4+2/5+3/4 = 7*x // - 7*x
1/4-(7*x)+2/5+3/4 = 0
1/4-7*x+2/5+3/4 = 0
7/5-7*x = 0 // - 7/5
-7*x = -7/5 // : -7
x = -7/5/(-7)
x = 1/5
x = 1/5
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