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(1/2)*x+(5/6)*x-(3/5)+3/10 = 0
(1/2)*x+(5/6)*x-3/5+3/10 = 0
4/3*x-3/10 = 0 // + 3/10
4/3*x = 3/10 // : 4/3
x = 3/10/4/3
x = 9/40
x = 9/40
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