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-39/70 = (1/4)*x-x-(6/7) // - (1/4)*x-x-(6/7)
x-((1/4)*x)-39/70+6/7 = 0
x+(-1/4)*x-39/70+6/7 = 0
3/4*x+3/10 = 0 // - 3/10
3/4*x = -3/10 // : 3/4
x = -3/10/3/4
x = -2/5
x = -2/5
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