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x in (-oo:+oo)
4*(1/10-2*x) = -18/5 // + -18/5
4*(1/10-2*x)-(-18/5) = 0
4*(1/10-2*x)+18/5 = 0
(4*5*(1/10-2*x))/5+18/5 = 0
4*5*(1/10-2*x)+18 = 0
20-40*x = 0
(20-40*x)/5 = 0
(20-40*x)/5 = 0 // * 5
20-40*x = 0
20-40*x = 0 // - 20
-40*x = -20 // : -40
x = -20/(-40)
x = 1/2
x = 1/2
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