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x in (-oo:+oo)
(-4/7)*x-(3/7) = -5/7 // + -5/7
(-4/7)*x-(3/7)-(-5/7) = 0
(-4/7)*x-3/7+5/7 = 0
2/7-4/7*x = 0 // - 2/7
-4/7*x = -2/7 // : -4/7
x = -2/7/(-4/7)
x = 1/2
x = 1/2
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