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x in (-oo:+oo)
(7/8)*x-30 = (1/2)*x // - (1/2)*x
(7/8)*x-((1/2)*x)-30 = 0
(7/8)*x+(-1/2)*x-30 = 0
3/8*x-30 = 0 // + 30
3/8*x = 30 // : 3/8
x = 30/3/8
x = 80
x = 80
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