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x in (-oo:+oo)
2*x = (3/8)*x+30 // - (3/8)*x+30
2*x-((3/8)*x)-30 = 0
2*x+(-3/8)*x-30 = 0
13/8*x-30 = 0 // + 30
13/8*x = 30 // : 13/8
x = 30/13/8
x = 240/13
x = 240/13
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