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1/3-(3*((2/7)*x-4)) = 0
1/3-3*((2/7)*x-4) = 0
1/3-3*(2/7*x-4) = 0
(-3*3*(2/7*x-4))/3+1/3 = 0
1-3*3*(2/7*x-4) = 0
37-18/7*x = 0
(37-18/7*x)/3 = 0
(37-18/7*x)/3 = 0 // * 3
37-18/7*x = 0
37-18/7*x = 0 // - 37
-18/7*x = -37 // : -18/7
x = -37/(-18/7)
x = 259/18
x = 259/18
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