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13 = (3*x)/2+21/4 // - (3*x)/2+21/4
13-((3*x)/2)-(21/4) = 0
(-3/2)*x-21/4+13 = 0
31/4-3/2*x = 0 // - 31/4
-3/2*x = -31/4 // : -3/2
x = -31/4/(-3/2)
x = 31/6
x = 31/6
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