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6/7-((2/7)*x)-(7*x) = 9/70 // - 9/70
6/7-((2/7)*x)-(7*x)-(9/70) = 0
(-2/7)*x-7*x+6/7-9/70 = 0
51/70-51/7*x = 0 // - 51/70
-51/7*x = -51/70 // : -51/7
x = -51/70/(-51/7)
x = 1/10
x = 1/10
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