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x in (-oo:+oo)
1/2-((5/8)*x) = (7/8)*x+7/2 // - (7/8)*x+7/2
1/2-((5/8)*x)-((7/8)*x)-(7/2) = 0
(-5/8)*x+(-7/8)*x+1/2-7/2 = 0
-3/2*x-3 = 0 // + 3
-3/2*x = 3 // : -3/2
x = 3/(-3/2)
x = -2
x = -2
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