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6/7-5*x+4/7 = (-2*x)/(-5) // - (-2*x)/(-5)
6/7-5*x-((-2*x)/(-5))+4/7 = 0
(-2/5)*x-5*x+6/7+4/7 = 0
10/7-27/5*x = 0 // - 10/7
-27/5*x = -10/7 // : -27/5
x = -10/7/(-27/5)
x = 50/189
x = 50/189
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