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x in (-oo:+oo)
x/2-7 = 6-((4*x)/5) // - 6-((4*x)/5)
x/2+(4*x)/5-7-6 = 0
13/10*x-13 = 0 // + 13
13/10*x = 13 // : 13/10
x = 13/13/10
x = 10
x = 10
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