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-146/21 = (1/3)*x-2*x-6 // - (1/3)*x-2*x-6
6-(-2*x)-((1/3)*x)-146/21 = 0
2*x+(-1/3)*x-146/21+6 = 0
5/3*x-20/21 = 0 // + 20/21
5/3*x = 20/21 // : 5/3
x = 20/21/5/3
x = 4/7
x = 4/7
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