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x in (-oo:+oo)
-5 = (1/2)*(6*x-2)+7*x // - (1/2)*(6*x-2)+7*x
-((1/2)*(6*x-2))-(7*x)-5 = 0
(-1/2)*(6*x-2)-7*x-5 = 0
-1/2*(6*x-2)-7*x-5 = 0
-1/2*(6*x-2)-7*x-5 = 0
1-10*x-5 = 0
-10*x-4 = 0
-10*x-4 = 0
-10*x-4 = 0 // + 4
-10*x = 4 // : -10
x = 4/(-10)
x = -2/5
x = -2/5
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