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(6*(5*x+6))/3+3*x = 103 // - 103
(6*(5*x+6))/3+3*x-103 = 0
(6*(5*x+6))/3+(3*3*x)/3+(-103*3)/3 = 0
6*(5*x+6)+3*3*x-103*3 = 0
39*x-309+36 = 0
39*x-273 = 0
(39*x-273)/3 = 0
(39*x-273)/3 = 0 // * 3
39*x-273 = 0
39*x-273 = 0 // + 273
39*x = 273 // : 39
x = 273/39
x = 7
x = 7
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