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x in (-oo:+oo)
(1/2)*x-(3/5) = -4/7 // + -4/7
(1/2)*x-(3/5)-(-4/7) = 0
(1/2)*x-3/5+4/7 = 0
1/2*x-1/35 = 0 // + 1/35
1/2*x = 1/35 // : 1/2
x = 1/35/1/2
x = 2/35
x = 2/35
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