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9/10 = (3*x)/2-((7*x)/5) // - (3*x)/2-((7*x)/5)
(7*x)/5-((3*x)/2)+9/10 = 0
(-3/2)*x+(7*x)/5+9/10 = 0
9/10-1/10*x = 0 // - 9/10
-1/10*x = -9/10 // : -1/10
x = -9/10/(-1/10)
x = 9
x = 9
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