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x in (-oo:+oo)
(-1/2)*x-(7/5) = 8/7 // - 8/7
(-1/2)*x-(7/5)-(8/7) = 0
(-1/2)*x-7/5-8/7 = 0
-1/2*x-89/35 = 0 // + 89/35
-1/2*x = 89/35 // : -1/2
x = 89/35/(-1/2)
x = -178/35
x = -178/35
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