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(2*x)/5-(3/4) = (5*x)/2 // - (5*x)/2
(2*x)/5-((5*x)/2)-(3/4) = 0
(2*x)/5+(-5/2)*x-3/4 = 0
-21/10*x-3/4 = 0 // + 3/4
-21/10*x = 3/4 // : -21/10
x = 3/4/(-21/10)
x = -5/14
x = -5/14
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