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x in (-oo:+oo)
7/8 = (15/2)*x+4 // - (15/2)*x+4
7/8-((15/2)*x)-4 = 0
(-15/2)*x+7/8-4 = 0
-15/2*x-25/8 = 0 // + 25/8
-15/2*x = 25/8 // : -15/2
x = 25/8/(-15/2)
x = -5/12
x = -5/12
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