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