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