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(1/5)*(5*x+4)-((1/3)*(x+7)) = 4 // - 4
(1/5)*(5*x+4)-((1/3)*(x+7))-4 = 0
(1/5)*(5*x+4)+(-1/3)*(x+7)-4 = 0
1/5*(5*x+4)-1/3*(x+7)-4 = 0
1/5*(5*x+4)-1/3*(x+7)-4 = 0
2/3*x-4-23/15 = 0
2/3*x-83/15 = 0
2/3*x-83/15 = 0
2/3*x-83/15 = 0 // + 83/15
2/3*x = 83/15 // : 2/3
x = 83/15/2/3
x = 83/10
x = 83/10
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