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(2*(-x-3))/7-(3*x) = -8 // + 8
(2*(-x-3))/7-(3*x)+8 = 0
(2*(-x-3))/7-3*x+8 = 0
(2*(-x-3))/7+(-3*7*x)/7+(7*8)/7 = 0
2*(-x-3)-3*7*x+7*8 = 0
56-23*x-6 = 0
50-23*x = 0
(50-23*x)/7 = 0
(50-23*x)/7 = 0 // * 7
50-23*x = 0
50-23*x = 0 // - 50
-23*x = -50 // : -23
x = -50/(-23)
x = 50/23
x = 50/23
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