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(350-x)/7-3 = 1200 // - 1200
(350-x)/7-1200-3 = 0
(350-x)/7+(-1200*7)/7+(-3*7)/7 = 0
350-x-1200*7-3*7 = 0
-x-8050-21 = 0
-x-8071 = 0
(-x-8071)/7 = 0
(-x-8071)/7 = 0 // * 7
-x-8071 = 0
-x-8071 = 0 // + 8071
-x = 8071 // * -1
x = -8071
x = -8071
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