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(-4/7)*x+1/2 = 381/14-3*x // - 381/14-3*x
(-4/7)*x-(-3*x)+1/2-(381/14) = 0
(-4/7)*x+3*x+1/2-381/14 = 0
17/7*x-187/7 = 0 // + 187/7
17/7*x = 187/7 // : 17/7
x = 187/7/17/7
x = 11
x = 11
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