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x in (-oo:+oo)
(1/2)*x-(3/7) = -5 // + 5
(1/2)*x-(3/7)+5 = 0
(1/2)*x-3/7+5 = 0
1/2*x+32/7 = 0 // - 32/7
1/2*x = -32/7 // : 1/2
x = -32/7/1/2
x = -64/7
x = -64/7
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