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(8/9)*x+9/10 = 2/5-(3*x) // - 2/5-(3*x)
(8/9)*x+3*x+9/10-(2/5) = 0
(8/9)*x+3*x+9/10-2/5 = 0
35/9*x+1/2 = 0 // - 1/2
35/9*x = -1/2 // : 35/9
x = -1/2/35/9
x = -9/70
x = -9/70
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