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x in (-oo:+oo)
(-7/5)*x = 7/12 // - 7/12
(-7/5)*x-(7/12) = 0
(-7/5)*x-7/12 = 0
-7/5*x-7/12 = 0 // + 7/12
-7/5*x = 7/12 // : -7/5
x = 7/12/(-7/5)
x = -5/12
x = -5/12
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