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x in (-oo:+oo)
x/4-(x/5) = 7/4 // - 7/4
x/4-(x/5)-(7/4) = 0
x/4-(x/5)-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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