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x in (-oo:+oo)
(-7/5)*x = -4 // + 4
(-7/5)*x+4 = 0
4-7/5*x = 0 // - 4
-7/5*x = -4 // : -7/5
x = -4/(-7/5)
x = 20/7
x = 20/7
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