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(-2/7)*x-(2/13) = 0
(-2/7)*x-2/13 = 0
-2/7*x-2/13 = 0 // + 2/13
-2/7*x = 2/13 // : -2/7
x = 2/13/(-2/7)
x = -7/13
x = -7/13
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