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x in (-oo:+oo)
(6/5)*(2*x+1)-((7/10)*(x-7)) = 1 // - 1
(6/5)*(2*x+1)-((7/10)*(x-7))-1 = 0
(6/5)*(2*x+1)+(-7/10)*(x-7)-1 = 0
6/5*(2*x+1)-7/10*(x-7)-1 = 0
6/5*(2*x+1)-7/10*(x-7)-1 = 0
17/10*x-1+61/10 = 0
17/10*x+51/10 = 0
17/10*x+51/10 = 0
17/10*x+51/10 = 0 // - 51/10
17/10*x = -51/10 // : 17/10
x = -51/10/17/10
x = -3
x = -3
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