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x in (-oo:+oo)
(7/5)*x-(3/20) = (1/2)*x // - (1/2)*x
(7/5)*x-((1/2)*x)-(3/20) = 0
(7/5)*x+(-1/2)*x-3/20 = 0
9/10*x-3/20 = 0 // + 3/20
9/10*x = 3/20 // : 9/10
x = 3/20/9/10
x = 1/6
x = 1/6
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