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(5/6)*(x+4) = 15 // - 15
(5/6)*(x+4)-15 = 0
5/6*(x+4)-15 = 0
5/6*(x+4)-15 = 0
5/6*x-35/3 = 0
5/6*x-35/3 = 0
5/6*x-35/3 = 0 // + 35/3
5/6*x = 35/3 // : 5/6
x = 35/3/5/6
x = 14
x = 14
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