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-7*x-(2/5) = (2/7)*x-257/5 // - (2/7)*x-257/5
-7*x-((2/7)*x)-(2/5)-(-257/5) = 0
(-2/7)*x-7*x-2/5+257/5 = 0
51-51/7*x = 0 // - 51
-51/7*x = -51 // : -51/7
x = -51/(-51/7)
x = 7
x = 7
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