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(6-(2*x))/9 = -4 // + 4
(6-(2*x))/9+4 = 0
(6-2*x)/9+4 = 0
(6-2*x)/9+(4*9)/9 = 0
4*9-2*x+6 = 0
42-2*x = 0
(42-2*x)/9 = 0
(42-2*x)/9 = 0 // * 9
42-2*x = 0
42-2*x = 0 // - 42
-2*x = -42 // : -2
x = -42/(-2)
x = 21
x = 21
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