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(2/5)*x+6/5 = (7/2)*x+21/10+1/2 // - (7/2)*x+21/10+1/2
(2/5)*x-((7/2)*x)+6/5-(21/10)-(1/2) = 0
(2/5)*x+(-7/2)*x+6/5-21/10-1/2 = 0
-31/10*x-7/5 = 0 // + 7/5
-31/10*x = 7/5 // : -31/10
x = 7/5/(-31/10)
x = -14/31
x = -14/31
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