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(2*x)/3 = (4*x)/5-4 // - (4*x)/5-4
(2*x)/3-((4*x)/5)+4 = 0
(2*x)/3+(-4/5)*x+4 = 0
4-2/15*x = 0 // - 4
-2/15*x = -4 // : -2/15
x = -4/(-2/15)
x = 30
x = 30
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