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x in (-oo:+oo)
(4*x)/5-(x/10) = 7 // - 7
(4*x)/5-(x/10)-7 = 0
7/10*x-7 = 0 // + 7
7/10*x = 7 // : 7/10
x = 7/7/10
x = 10
x = 10
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