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x in (-oo:+oo)
(7*x)/10-2 = (8*x)/15 // - (8*x)/15
(7*x)/10-((8*x)/15)-2 = 0
(7*x)/10+(-8/15)*x-2 = 0
1/6*x-2 = 0 // + 2
1/6*x = 2 // : 1/6
x = 2/1/6
x = 12
x = 12
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