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(1/2)*(5*x+4)-((1/3)*(x+7)) = 7 // - 7
(1/2)*(5*x+4)-((1/3)*(x+7))-7 = 0
(1/2)*(5*x+4)+(-1/3)*(x+7)-7 = 0
1/2*(5*x+4)-1/3*(x+7)-7 = 0
1/2*(5*x+4)-1/3*(x+7)-7 = 0
13/6*x-7-1/3 = 0
13/6*x-22/3 = 0
13/6*x-22/3 = 0
13/6*x-22/3 = 0 // + 22/3
13/6*x = 22/3 // : 13/6
x = 22/3/13/6
x = 44/13
x = 44/13
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