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x in (-oo:+oo)
(-1/2)*x+1 = 7*x-12 // - 7*x-12
(-1/2)*x-(7*x)+1+12 = 0
(-1/2)*x-7*x+1+12 = 0
13-15/2*x = 0 // - 13
-15/2*x = -13 // : -15/2
x = -13/(-15/2)
x = 26/15
x = 26/15
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