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-11/70 = 1/7-x-((1/5)*x) // - 1/7-x-((1/5)*x)
x+(1/5)*x-11/70-(1/7) = 0
x+(1/5)*x-11/70-1/7 = 0
6/5*x-3/10 = 0 // + 3/10
6/5*x = 3/10 // : 6/5
x = 3/10/6/5
x = 1/4
x = 1/4
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