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4*x-(2/7) = (4/5)*x-(2/7) // - (4/5)*x-(2/7)
4*x-((4/5)*x)-(2/7)+2/7 = 0
4*x+(-4/5)*x-2/7+2/7 = 0
16/5*x = 0 // : 16/5
x = 0
x = 0
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