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(-2/5)*x+1/2 = 6*x-521/110 // - 6*x-521/110
(-2/5)*x-(6*x)+1/2-(-521/110) = 0
(-2/5)*x-6*x+1/2+521/110 = 0
288/55-32/5*x = 0 // - 288/55
-32/5*x = -288/55 // : -32/5
x = -288/55/(-32/5)
x = 9/11
x = 9/11
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