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x in (-oo:+oo)
x/4-(x/5) = 7/5 // - 7/5
x/4-(x/5)-(7/5) = 0
x/4-(x/5)-7/5 = 0
1/20*x-7/5 = 0 // + 7/5
1/20*x = 7/5 // : 1/20
x = 7/5/1/20
x = 28
x = 28
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