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72/7 = 6*x+(2/7)*x+4 // - 6*x+(2/7)*x+4
72/7-(6*x)-((2/7)*x)-4 = 0
(-2/7)*x-6*x+72/7-4 = 0
44/7-44/7*x = 0 // - 44/7
-44/7*x = -44/7 // : -44/7
x = -44/7/(-44/7)
x = 1
x = 1
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