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