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