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(21*x)/21-((3*x)/21)+9+14 = 5/21 // - 5/21
(21*x)/21-((3*x)/21)-(5/21)+9+14 = 0
(21*x)/21+(-1/7)*x-5/21+9+14 = 0
6/7*x+478/21 = 0 // - 478/21
6/7*x = -478/21 // : 6/7
x = -478/21/6/7
x = -239/9
x = -239/9
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