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(-2/5)*x-(4/7) = -62/35 // + -62/35
(-2/5)*x-(4/7)-(-62/35) = 0
(-2/5)*x-4/7+62/35 = 0
6/5-2/5*x = 0 // - 6/5
-2/5*x = -6/5 // : -2/5
x = -6/5/(-2/5)
x = 3
x = 3
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