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