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5*x-(6*x)-15 = 6-((6*x)/54) // - 6-((6*x)/54)
5*x-(6*x)+(6*x)/54-15-6 = 0
5*x-6*x+(6*x)/54-15-6 = 0
-8/9*x-21 = 0 // + 21
-8/9*x = 21 // : -8/9
x = 21/(-8/9)
x = -189/8
x = -189/8
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